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Store Lo Byte of Program Memory Store Hi Byte of Program Memory
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MID-RANGE BUILT-IN EEPROM/FLASH ACCESS
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Writing to program memory is similar to writing to data but also has the two nops in which the operation takes place. No polling or interrupts are available for this operation; instead, the processor halts during this operation. Even though the processor has stopped for a program memory write, peripheral function (ADCs, serial I/O, etc.) are still active.
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bsf movlw movwf movlw movwf movlw movwf movlw movwf bsf bsf bsf bcf movlw movwf movlw movwf nop nop bcf bsf STATUS, RP1 LOW address/ADDR, w EEADR HIGH address/ADDR, w EEADRH LOW Constant/DATA, w EEDATA HIGH Constant/DATA, w EEDATAH STATUS, RPO EECON1 ^ 0x0180, EEPGO EECON1 ^ 0x0180, WREN INTCON, GIE 0x055 EECON2 ^ 0x0180 0x0AA EECON2 ^ 0x0180, OR ;
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/movf /movwf /movwf /movwf
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; Operation delay ; NOPs EECON1 ^ 0x0180, WREN INTCON, GIE
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LOW-END BUILT-IN DATA EEPROM
The low-end architecture, with its 32-address-register page, does not have many registers or space that can be devoted to advanced peripheral I/O functions. For this reason, when PIC12C5xx parts were given built-in EEPROM (and designated the PIC12CE5xx), a fairly clever interface had to be developed. This interface consists of connecting the EEPROM within the PIC microcontroller as if it were an external I2C device. Reading and writing data is more complex than in mid-range devices (where there are registers for I/O operations). But the read/write operations are relatively simple to code. I must point out that in the time since the second edition of this book came out, several new part numbers are available that are cheaper than the parts discussed here and use the same data EEPROM access as the mid-range and PIC18 microcontrollers described in the preceding section. While I have left this section in the third edition for completeness and to give you an example how an I2C bit banging interface to a single device would be implemented, I would recommend that you consider the other devices rst before the PIC12CE5xx microcontrollers. The EEPROM-included PIC12CE5xx parts use the most signi cant bits of the general purpose I/O (GPIO) register and its corresponding TRIS register. The PIC12CE5xx s EEPROM interface can be described as I ve shown in the block diagram in Fig. 16.1.
PIC MCU OPTIONAL HARDWARE FEATURES
Low-end PIC Micro Core
Data7
Latch
EEPROM
Data6
Latch_Q
Read
Data
Data5-0
GPIO Latch GPIO TRIS
Read
Read
I/O Pins
Figure 16.1 The low-end PIC microcontroller EEPROM solutions consist of the MCU interfacing to the EEPROM via I2C.
In this gure, GPIO bits 6 and 7n do not have TRIS control bits. In addition, bit 6 (the PIC12Cxx EEPROM bit SDA) has an open-drain driver. This driver circuit is designed to let both the PIC microcontroller and the EEPROM drive the data line at different intervals without having to disable the PIC microcontroller s write of the EEPROM. Information is written to the EEPROM device using the waveform shown in Fig. 16.2. Note that for timing I use instruction cycles for a PIC microcontroller running at 4 MHz. The start and stop bits are used to indicate the beginning and end of an operation and can be used halfway through to halt an operation. The start and stop bits actually are invalid cases (data cannot change while one clock is active or high). This operation means that the GPIO port must be accessed carefully; always make sure that the SDA and SCL GPIO bits have a 1 in them or else the built-in EEPROM
Start to Bit Delay 2 Cycles
Data Latch
I2C Idle I2C Start 3 Cycles Next Bit Data Setup 3 Cycles Stop Bit 3 Cycles
Data Transfer 10 Cycles
Figure 16.2 The basic data waveforms that must be produced by the low-end PIC microcontroller to access the built in EEPROM.
MID-RANGE BUILT-IN EEPROM/FLASH ACCESS
may be accessed incorrectly, causing problems with subsequent reads. You should never use the instruction
clrf GPIO
Data is written to the most signi cant bit rst, which is probably backwards to most applications. Before any transfer, a control byte has to be written. The control byte data is in the format
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