PIC16C54C-04/P【PDF 122/194 页】IC MCU OTP 512X12 18DIP

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2002 Microchip Technology Inc.

Preliminary

DS30453D-page 31

PIC16C5X

6.5

Program Counter

As a program instruction is executed, the Program

Counter (PC) will contain the address of the next pro-

gram instruction to be executed. The PC value is

increased by one, every instruction cycle, unless an

instruction changes the PC.

For a GOTO instruction, bits 8:0 of the PC are provided

by the GOTO instruction word. The PC Latch (PCL) is

mapped to PC<7:0> (Figure 6-7, Figure 6-8 and

Figure 6-9).

For

the

PIC16C56,

PIC16CR56,

PIC16C57,

PIC16CR57, PIC16C58 and PIC16CR58, a page num-

ber must be supplied as well. Bit5 and bit6 of the STA-

TUS Register provide page information to bit9 and

bit10 of the PC (Figure 6-8 and Figure 6-9).

For a CALL instruction, or any instruction where the

PCL is the destination, bits 7:0 of the PC again are pro-

vided by the instruction word. However, PC<8> does

not come from the instruction word, but is always

cleared (Figure 6-7 and Figure 6-8).

Instructions where the PCL is the destination, or modify

PCL instructions, include MOVWF PCL, ADDWF PCL,

and BSF PCL,5.

For

the

PIC16C56,

PIC16CR56,

PIC16C57,

PIC16CR57, PIC16C58 and PIC16CR58, a page num-

ber again must be supplied. Bit5 and bit6 of the STA-

TUS Register provide page information to bit9 and

bit10 of the PC (Figure 6-8 and Figure 6-9).

FIGURE 6-7:

LOADING OF PC

BRANCH INSTRUCTIONS

- PIC16C54, PIC16CR54,

PIC16C55

FIGURE 6-8:

LOADING OF PC

BRANCH INSTRUCTIONS

- PIC16C56/PIC16CR56

FIGURE 6-9:

LOADING OF PC

BRANCH INSTRUCTIONS

- PIC16C57/PIC16CR57,

AND PIC16C58/

PIC16CR58

Note:

Because PC<8> is cleared in the CALL

instruction, or any modify PCL instruction,

all subroutine calls or computed jumps are

limited to the first 256 locations of any pro-

gram memory page (512 words long).

PCL

Reset to ’0’

Instruction Word

GOTO Instruction

CALL or Modify PCL Instruction

PA<1:0>

STATUS

PCL

PA<1:0>

STATUS

PCL

Instruction Word

Reset to ‘0’

Instruction Word

GOTO Instruction

CALL or Modify PCL Instruction

PA<1:0>

STATUS

PCL

PA<1:0>

STATUS

PCL

Instruction Word

Reset to ‘0’

Instruction Word

GOTO Instruction

CALL or Modify PCL Instruction

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