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PROGRAMMING PIC MICROCONTROLLERS
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TABLE 4.10 PIN
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YAP-II 19-PIN INTERFACE FUNCTION U1 CONNECTION U2 CONNECTION
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Gnd Vcc _Reset YAP-II oscillator U1 serial in U1 serial out U2 RA0 U2 RA1 U2 RA2 U2 RA3 U2 RA4 U2 RB0 U2 RB1 U2 RB2 U2 RB3 U2 RB4 U2 RB5 U2 RB6 programming clock U2 RB7 programming data RB4/R9 RB5/R8 RA4/1K resistor RA1/1K resistor RA0 RA1 RA2 RA3 RA4 RB0 RB1 RB2 RB3 RB4 RB5 RB6 RB7 RB6/1K resistor No direct connect
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connections passed to the J5 connector, so different circuits can be built with it. The piezo speaker is connected to J5 through a 0.47 uF capacitor so that the driver is isolated from the speaker (and any transients coming from it). Finally, there are two pull-ups for convenience s sake. The pinout of J5 is listed in Table 4.12.
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TABLE 4.11 PIN YAP-II ICSP CONNECTOR PIN DEFINITION FUNCTION
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Vpp Connected to PIC MCU MCLR# pin Vdd Vss ICSP data ICSP clock
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TABLE 4.12 YAP-II ACCESSORY CONNECTOR PIN DEFINITION PIN FUNCTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8 LED9 LED10 BUT1 BUT2 POT1 POT2 Wiper POT2 Connection 1 POT2 Connection 2 Speaker Pull-Up 1 Pull-Up 2
The original YAP was well designed for the PIC16F84 and PIC16Cx(x)1 part numbers, but not very many others. The YAP-II is designed for a wider range of PIC microcontrollers with varying program memory sizes. In the YAP-II, I ve further simpli ed the command set so that a single character is sent as a command, followed by a carriage return. The 13 commands are listed in Table 4.13. The interface itself is designed to run at 1200 bps. This speed was chosen as the fastest standard speed for the time it takes to receive 4 bytes (from a hex le) giving an instruction for programming and perform a programming operation in parallel. Running the interface at 1200 bps makes the YAP somewhat slower than other PIC microcontroller programmers, but the alternative would be to add an external buffer memory, which would add to the cost of the device. When demonstrating how the commands work, I have provided screen shots of HyperTerminal operating with the data shown on the display. HyperTerminal operation
PROGRAMMING PIC MICROCONTROLLERS
TABLE 4.13 COMMAND
YAP-II COMMANDS OPERATION
A B C D E F G 1, 2, 4, 8
Ping Return nothing but carriage return/line feed Reset the program counter to 0 Clear the contents of Flash memory Dump 256 instructions increment Read program counter by 256 EPROM part programming Text Send hex le Flash part programming Text Send hex le Get 8 instructions starting at address 0x02000 Run PIC microcontroller at the speci ed speed
is explained elsewhere, but to connect to the YAP-II, HyperTerminal should be set up with a direct connect to the YAP-II at 1200 bps with an 8-N-1 data format. The interface will convert lowercase ASCII to uppercase and ignores all characters except for the ones listed in the table above and ASCII Backspace (0x008) and Enter (0x00D). The ping command is designed for advanced interfaces (like the Visual Basic interface that is presented below) to check to see if the YAP-II is connected and working properly. After sending ASCII A (0x041), followed by an ASCII Enter (0x00D), the YAP-II returns a carriage return/line feed string. This instruction is simply used for checking the interface without having to parse the
<== Invalid
message that is returned for invalid commands (everything other than the 13 commands listed in Table 4.13). During programming, the PIC microcontroller uses its built-in program counter for keeping track of where operations are taking place. This program counter is shadowed within the YAP-II to keep track of where it is executing. I use the shadowed program counter to keep track of the offset of the 256 instructions last returned by the YAP-II during the Dump instruction. To reset it, the B command is used. The C command clears the contents of Flash program memory using the Microchip speci ed All Clear instruction. This is the same process as was discussed above.
1 Apply Vpp. 2 Execute load con guration (0b0000000 0x07FFE). 3 Increment the PC to the con guration register word (send 0b0000110 seven times).
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