PIC16C641 Datasheet

IC型号：
PIC16C641
PDF描述：
8-Bit EPROM Microcontrollers with Analog Comparators
文件大小：
661.21KB
PDF页数：
137页
芯片厂家：
MICROCHIP

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PIC16C64X & PIC16C66X

10.1

Special Function Registers as

Source/Destination

The PIC16C64X & PIC16C66X鈥檚 orthogonal instruction

set allows read and write of all 铿乴e 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:

Write PCL:

Read-Modify-Write:

PCL

鈫?/div>

dest

PCLATH

鈫?/div>

PCH;

8-bit destination value

鈫?/div>

PCL

鈫?/div>

ALU operand

PCLATH

鈫?/div>

PCH;

8-bit result

鈫?/div>

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 铿乺st 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.

DS30559A-page 74

漏

1996 Microchip Technology Inc.

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