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參數(shù)資料
| 型號： | 12CE673 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | HookUp/Lead Wire; Conductor Size AWG:18; No. Strands x Strand Size:65 x 36; Jacket Color:Black; Conductor Material:Copper; Jacket Material:Rubber; Leaded Process Compatible:Yes; Number of Conductors:1; Outer Diameter:0.144" RoHS Compliant: Yes |
| 中文描述： | 8引腳，8位CMOS微控制器與A / D轉(zhuǎn)換器和EEPROM數(shù)據(jù)存儲器 |
| 文件頁數(shù)： | 22/116頁 |
| 文件大小： | 671K |
| 代理商： | 12CE673 |
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PIC12CE67X
DS40181B-page 22
Preliminary
1998 Microchip Technology Inc.
4.3
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 4-10 shows the
two situations for the loading of the PC. The upper
example in the figure shows how the PC is loaded on a
write to PCL (PCLATH<4:0>
→
PCH). The lower exam-
ple in the figure shows how the PC is loaded during a
CALL
or
GOTO
instruction (PCLATH<4:3>
→
PCH).
PCL and PCLATH
FIGURE 4-10: LOADING OF PC IN
DIFFERENT SITUATIONS
4.3.1
COMPUTED GOTO
A computed GOTO is accomplished by adding an off-
set 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
PCL as
Destination
ALU result
GOTO, CALL
Opcode <10:0>
8
PC
12
11 10
0
11
PCLATH<4:3>
PCH
PCL
8
7
2
PCLATH
PCH
PCL
4.3.2
STACK
The PIC12C67X family has an 8 level deep x 13-bit
wide hardware stack. 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 inter-
rupt 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 first
push. The tenth push overwrites the second push (and
so on).
4.4
The
PCLATH<4:3>, which are used to access program
memory when more than one page is available. The
use of PCLATH<4:3> as general purpose read/write
bits for the PIC12CE67X is not recommended since
this may affect upward compatibility with future prod-
ucts.
Program Memory Paging
PIC12CE67X
ignores
both
paging
bits
Note 1:
There are no status bits to indicate stack
overflow or stack underflow 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
instruc-
tions, or the vectoring to an interrupt
address.
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