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Set new program counter value Display the primary special function registers in the PIC microcontroller MCU
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Display the contents of 16 registers starting at Register address Display and optionally change the contents of the speci ed register Toggle a breakpoint at either the speci ed address or the current program counter Clear all the breakpoints in the emulator
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Disassemble the 22 instructions starting at either the current program counter or the speci ed address Load hex values that are to be entered into program memory either starting at the current program counter or the speci ed address Program an EPROM or Flash PIC microcontroller MCU from the contents of the EMU-II s program memory Verify the contents of a PIC microcontroller MCU with the contents of the EMU-II s program memory
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system (PC) download was not preempted by another task. No characters should be entered in the PC keyboard until the EMU-II prompt (which will be at address 0) has been displayed. The register names listed in Table 5.3 have been built into the EMU-II to allow for some symbolic application debugging.
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TABLE 5.3
REGISTERS SUPPORTED BY THE EMU-II BANK 0 BANK 1 REGISTER NAME ADDRESS REGISTER NAME
ADDRESS
0x000 0x001 0x002 0x003 0x004 0x005 0x006 0x007 0x008 0x009 0x00A 0x00B 0x00C 0x00D 0x00E 0x00F 0x010 0x011 0x012 0x013 0x014 0x015 0x016 0x017 0x018 0x019
INDF TMR0 PCL STATUS FSR PORTA PORTB PORTC PORTD (1) PORTE (1) PCLATH INTCON PIR1 PIR2 TMR1L TMR1H TCON1 TMR2 TCON2 SSPBUF SSPCON CCPR1L CCPR1H CCP1CON RCSTA (4) TXREG (4)
0x080 0x081 0x082 0x083 0x084 0x085 0x086 0x087 0x088 0x089 0x08A 0x08B 0x08C 0x08D 0x08E 0x08F 0x090 0x091 0x092 0x093 0x094 0x095 0x096 0x097 0x098 0x099
INDF OPTION (2) PCL STATUS FSR TRISA TRISB TRISC TRISD (1) TRISE (1) PCLATH INTCON PIE1 PIE2 PCON Zero (3) Zero (3) SSPCON2 PR2 SSPADD SSPSTAT Zero (3) Zero (3) Zero (3) TXSTA (4) SPBRG (4)
THE EMU-II
TABLE 5.3
REGISTERS SUPPORTED BY THE EMU-II (CONTINUED) BANK 0 BANK 1 REGISTER NAME ADDRESS REGISTER NAME
ADDRESS
0x01A 0x01B 0x01C 0x01D 0x01E 0x01F
RCREG (4) CCPR2L CCPR2H CCP2CON ADRESH ADCON0
0x09A 0x09B 0x09C 0x09D 0x09E 0x09F
Zero (3) Zero (3) Zero (3) Zero (3) ADRESL ADCON1
1. Registers and I/O ports are not available in the PIC16F876. 2. Register is known as OPTION_REG in Microchip documentation/tools. 3. No special functions are devoted to these registers, 0x000 always returned upon register read. 4. Registers used by the EMU-II. These registers along with the EEPROM registers (EEDATA, EEDATH, EEADR, EEADRH, EECON1, and EECON2) should never be accessed except using the functions listed below.
As indicated in the table notes, the USART and EEPROM registers should never be accessed by an application. Instead, the functions listed in Table 5.4 should be used for serial communications with the PC host and for accessing the data EEPROM. The program memory EEPROM must never be accessed. The serial port registers are enabled for noninterrupt communications at 1200-8-N-1 and should not be modi ed in any way. Applications written for generic PIC microcontroller MCU applications can be debugged using the EMU-II with very little modi cation. The EMU-II was designed
TABLE 5.4 ADDRESS
BUILT-IN INTERFACE FUNCTIONS FUNCTION NAME DESCRIPTION
0x07B0 0x07C0 0x07D0 0x07E0 0x07F0
SerialPoll SerialRead SerialWrite EERead EEWrite
If character received and not yet read, return with the carry ag set Wait until a character has been received and return it in w Send the character in w out serially to the host Read the data EEPROM at the address speci ed in FSR Write the data EEPROM with the value in w at the address speci ed in FSR
EMULATORS AND DEBUGGERS
to minimize the need for developing applications that had to be modi ed for both EMU-II operation and actual application operation. To create applications that can be debugged on the EMU-II, the following rules must be followed:
nop as the rst instruction at address 0x0000. The maximum size of the application is 1,791 (0x06FF) instructions. Variables should start at 0x020 rather than 0x00C as is possible in some devices. Use the USART and EEPROM functions listed above and do not access the special function registers that control these functions directly. For variables that are accessed from either Bank 0 or Bank 1, use address range 0x070 to 0x07E. Ideally, applications should not access any registers in Bank 2 or Bank 3 as the EMU-II state variables are stored in these banks along with the EEPROM access control registers. The nop instruction at the start of the application is used to allow a goto EmuIIReset instruction, which jumps to the EMU-II emulator application when the EMU-II rst boots. This goto instruction is tested for in the EMU-II software and is treated like a nop during application execution. As noted above, applications cannot be larger than 1,791 (0x06FF) instructions. The reason for this size is that the 256 instructions at addresses 0x0700 to 0x07FF is used by the EMU-II to provide an interface for the breakpoint handlers as well as the USART/data EEPROM functions listed above. As will be discussed below, when a breakpoint is set in the application, it jumps to the handler address. By placing the handler vectors in the rst page, a single goto instruction is required and the PCLATH registers do not have to be modi ed by the breakpoint operation. It is recommended that all applications specify the con guration ags to be used by the nal PIC microcontroller application using the __CONFIG statement in the application source code. The con g and __IDLOCS data will be stored within the EMU-II and will be programmed into a PIC microcontroller using the Program and Verify commands. I originally wanted this application to take advantage of the built-in debug features demonstrated by MPLAB ICD. The MPLAB ICD s operation and the PIC16F87x builtin debug features are not documented by Microchip so I did a bit of hacking to nd out what was going on inside them and how they worked. Actually, the hacking just consisted of taking a PIC16F877 that had been programmed by the MPLAB-ICD and looking at what was put in it. I found that code that was very similar to an interrupt handler was placed at addresses 0x01F00 to 0x01FFF. This matched what I expected based on the requirements for the MPLAB ICD in the speci cations Microchip indicates that no application code can be placed in the PIC microcontroller at addresses 0x01F00 to 0x01FFF. (Along with leaving 0x01F00 to 0x01FFF alone, address 0 must have a nop instruction.) To look at this code, I used my PICSTART Plus to read the contents of the PIC16F877 and then dumped the unassembled code into a text le. Once this was done, I spent some time labeling the code and making sure it could be reassembled properly (i.e., loaded back into a PIC16F877 and tested with MPLAB ICD). The resulting application code
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