参数资料
型号: PIC16LC556-04/SS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO20
封装: 0.209 INCH, PLASTIC, SSOP-20
文件页数: 16/104页
文件大小: 697K
代理商: PIC16LC556-04/SS
1996 Microchip Technology Inc.
Preliminary
DS40143A-page 19
PIC16C55X
4.3
PCL and PCLATH
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 bits (PC<12:8>) are not directly
readable or writable and come from PCLATH. On any
reset, the PC is cleared. Figure 4-10 shows the two
situations for the loading of the PC. The upper example in
the gure shows how the PC is loaded on a write to PCL
(PCLATH<4:0>
→ PCH). The lower example in the gure
shows how the PC is loaded during a CALL or GOTO
instruction (PCLATH<4:3>
→ PCH).
FIGURE 4-10: LOADING OF PC IN
DIFFERENT SITUATIONS
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
“Implementing a Table Read"
(AN556).
PC
12
8
7
0
5
PCLATH<4:0>
PCLATH
Instruction with
ALU result
GOTO, CALL
Opcode <10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
87
2
PCLATH
PCH
PCL
PCL as
Destination
4.3.2
STACK
The PIC16C55X family has an 8 level deep x 13-bit
wide hardware stack (Figure 4-1, Figure 4-2 and
Figure 4-3). The stack space is not part of either pro-
gram or data space and the stack pointer is not read-
able 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 rst
push. The tenth push overwrites the second push (and
so on).
Note 1: There are no STATUS bits to indicate
stack
overow
or
stack
underow
conditions.
Note 2:
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 vectoring to an interrupt
address.
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