PIC16C621A Datasheet

IC型号：
PIC16C621A
PDF描述：
EPROM-Based 8-Bit CMOS Microcontrollers
文件大小：
2148.18KB
PDF页数：
128页
芯片厂家：
Microchip

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PIC16C62X

4.3

PCL and PCLATH

4.3.2

STACK

The program counter (PC) is 13-bits wide. The low byte

comes from the PCL register, which is a readable and

writable register. The high byte (PC<12:8>) is not directly

readable or writable and comes from PCLATH. On any

reset, the PC is cleared. Figure 4-14 shows the two

situations for the loading of the PC. The upper example in

the 铿乬ure shows how the PC is loaded on a write to PCL

(PCLATH<4:0>

鈫?/div>

PCH). The lower example in the 铿乬ure

shows how the PC is loaded during a

CALL

GOTO

instruction (PCLATH<4:3>

鈫?/div>

PCH).

The PIC16C62X family has an 8 level deep x 13-bit

wide hardware stack (Figure 4-2 and Figure 4-3). The

stack space is not part of either program or data space

and the stack pointer is not readable or writable. The

PC is PUSHed onto the stack when a

CALL

instruction

is executed or an interrupt causes a branch. The stack

is POPed in the event of a

RETURN, RETLW

or a

RETFIE

instruction execution. PCLATH is not affected by a

PUSH or POP operation.

The stack operates as a circular buffer. This means that

after the stack has been PUSHed eight times, the ninth

push overwrites the value that was stored from the 铿乺st

push. The tenth push overwrites the second push (and

so on).

Note 1:

Instruction with

PCL as

Destination

ALU result

FIGURE 4-14: LOADING OF PC IN

DIFFERENT SITUATIONS

PCH

PCLATH<4:0>

PCL

There are no STATUS bits to indicate

stack over铿俹w or stack under铿俹w

conditions.

There are no instructions/mnemonics

called PUSH or POP. These are actions

that occur from the execution of the

CALL, RETURN, RETLW

and

RETFIE

instructions, or the vectoring to an

interrupt address.

Note 2:

PCLATH

PCH

PCLATH<4:3>

Opcode <10:0>

PCLATH

11 10

PCL

GOTO, CALL

4.3.1

COMPUTED GOTO

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 byte block). Refer to the

application note

鈥淚mplementing a Table Read"

(AN556).

漏

1998 Microchip Technology Inc.

Preliminary

DS30235G-page 23

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