参数资料
型号: PIC16C662T-04E/TQ
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PQFP44
封装: 10 X 10 MM, 1 MM HEIGHT, PLASTIC, TQFP-44
文件页数: 109/136页
文件大小: 634K
代理商: PIC16C662T-04E/TQ
PIC16C64X & PIC16C66X
DS30559A-page 74
1996 Microchip Technology Inc.
10.1
Special Function Registers as
Source/Destination
The PIC16C64X & PIC16C66X’s orthogonal instruction
set allows read and write of all le registers, including
special function registers. There are some special situ-
ations the user should be aware of:
10.1.1
STATUS AS DESTINATION
If an instruction writes to STATUS, the Z, C, and DC bits
may be set or cleared as a result of the instruction and
overwrite the original data bits written. For example,
executing CLRF STATUS will clear register STATUS,
and then set the Z bit leaving 0000 0100b in the reg-
ister.
10.1.2
PCL AS SOURCE OR DESTINATION
Read, write or read-modify-write on PCL may have the
following results:
Read PC:
PCL
→ dest
Write PCL:
PCLATH
→ PCH;
8-bit destination value
→ PCL
Read-Modify-Write:
PCL
→ ALU operand
PCLATH
→ PCH;
8-bit result
→ PCL
Where PCH = program counter high byte (not an
addressable register), PCLATH = Program counter
high holding latch, dest = destination, WREG or f.
10.1.3
BIT MANIPULATION
All bit manipulation instructions are done by rst read-
ing the entire register, operating on the selected bit and
writing the result back (read-modify-write). The user
should keep this in mind when operating on special
function registers, such as ports.
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