PIC16CR83 Datasheet

IC型号：
PIC16CR83
PDF描述：
18-pin Flash/EEPROM 8-Bit Microcontrollers
文件大小：
2018.18KB
PDF页数：
125页
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PIC16F8X

4.3

Program Counter: PCL and PCLATH

The Program Counter (PC) is 13-bits wide. The low

byte is the PCL register, which is a readable and

writable register. The high byte of the PC (PC<12:8>) is

not directly readable nor writable and comes from the

PCLATH register. The PCLATH (PC latch high) register

is a holding register for PC<12:8>. The contents of

PCLATH are transferred to the upper byte of the

program counter when the PC is loaded with a new

value. This occurs during a

CALL, GOTO

or a write to

PCL. The high bits of PC are loaded from PCLATH as

shown in Figure 4-1.

manipulation of the PCLATH<4:3> is not required for

the return instructions (which 鈥減ops鈥?the PC from the

stack).

Note:

The PIC16F8X ignores the PCLATH<4:3>

bits, which are used for program memory

pages 1, 2 and 3 (0800h - 1FFFh). The

use of PCLATH<4:3> as general purpose

R/W bits is not recommended since this

may affect upward compatibility with

future products.

4.4

Stack

FIGURE 4-1:

PCH

LOADING OF PC IN

DIFFERENT SITUATIONS

PCL

8 7

INST with PCL

as dest

PCLATH<4:0>

ALU result

The PIC16FXX has an 8 deep x 13-bit wide hardware

stack (Figure 4-1). The stack space is not part of either

program or data space and the stack pointer is not

readable or writable.

The entire 13-bit PC is 鈥減ushed鈥?onto the stack when a

CALL

instruction is executed or an interrupt is acknowl-

edged. The stack is 鈥減opped鈥?in the event of a

RETURN,

RETLW

or a

RETFIE

instruction execution. PCLATH is

not affected by a push or a pop operation.

Note:

There are no instruction mnemonics

called push or pop. These are actions that

occur from the execution of the

CALL,

RETURN, RETLW,

and

RETFIE

instruc-

tions, or the vectoring to an interrupt

address.

PCLATH

PCH

12 11 10

PCLATH<4:3>

Opcode <10:0>

PCL

8 7

GOTO, CALL

PCLATH

4.3.1

COMPUTED GOTO

The stack operates as a circular buffer. That is, after the

stack has been pushed eight times, the ninth push over-

writes the value that was stored from the 铿乺st push. The

tenth push overwrites the second push (and so on).

If the stack is effectively popped nine times, the PC

value is the same as the value from the 铿乺st pop.

Note:

There are no status bits to indicate stack

over铿俹w or stack under铿俹w conditions.

A computed GOTO is accomplished by adding an offset

to the program counter (ADDWF

PCL).

When doing a table

read using a computed GOTO method, care should be

exercised if the table location crosses a PCL memory

boundary (each 256 word block). Refer to the application

note

鈥淚mplementing a Table Read鈥?/div>

(AN556).

4.3.2

PROGRAM MEMORY PAGING

The PIC16F83 and PIC16CR83 have 512 words of pro-

gram memory. The PIC16F84 and PIC16CR84 have

1K of program memory. The

CALL

and

GOTO

instruc-

tions have an 11-bit address range. This 11-bit address

range allows a branch within a 2K program memory

page size. For future PIC16F8X program memory

expansion, there must be another two bits to specify

the program memory page. These paging bits come

from the PCLATH<4:3> bits (Figure 4-1). When doing a

CALL

or a

GOTO

instruction, the user must ensure that

these page bits (PCLATH<4:3>) are programmed to

the desired program memory page. If a

CALL

instruc-

tion (or interrupt) is executed, the entire 13-bit PC is

鈥減ushed鈥?onto the stack (see next section). Therefore,

DS30430C-page 18

漏

1998 Microchip Technology Inc.

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