PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 184
PIC17C752
Manufacturer Part Number
PIC17C752
Description
High-Performance 8-Bit CMOS EPROM Microcontrollers
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC17C752.pdf
(320 pages)
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Table 18-2 lists the instructions recognized by the
MPASM assembler.
All instruction examples use the following format to rep-
resent a hexadecimal number:
where h signifies a hexadecimal digit.
To represent a binary number:
where b signifies a binary string.
FIGURE 18-1: GENERAL FORMAT FOR
DS30264A-page 184
Byte-oriented file register operations
Byte to Byte move operations
Bit-oriented file register operations
Literal and control operations
CALL and GOTO operations
Note 1: Any unused opcode is Reserved. Use of
15
15
15
15
15
OPCODE
OPCODE
0xhh
0000 0100b
d = 0 for destination WREG
d = 1 for destination f
f = 8-bit file register address
p = peripheral register file address
f = 8-bit file register address
b = 3-bit address
f = 8-bit file register address
k = 8-bit immediate value
k = 13-bit immediate value
OPCODE
OPCODE
OPCODE
any reserved opcode may cause unex-
pected operation.
13 12
13 12
INSTRUCTIONS
p (FILE #)
11 10
9
8
b (BIT #)
d
8
8 7
7
7
8 7
k (literal)
f (FILE #)
f (FILE #)
k (literal)
f (FILE #)
0
0
0
0
0
18.1
The PIC17C75X’s orthogonal instruction set allows
read and write of all file registers, including special
function registers. There are some special situations
the user should be aware of:
18.1.1
If an instruction writes to ALUSTA, the Z, C, DC and OV
bits may be set or cleared as a result of the instruction
and overwrite the original data bits written. For exam-
ple, executing CLRF
ALUSTA, and then set the Z bit leaving 0000 0100b
in the register.
18.1.2
Read, write or read-modify-write on PCL may have the
following results:
Read PC:
Write PCL:
Read-Modify-Write:
Where PCH = program counter high byte (not an
addressable register), PCLATH = Program counter
high holding latch, dest = destination, WREG or f.
18.1.3
All bit manipulation instructions are done by first read-
ing the entire register, operating on the selected bit and
writing the result back (read-modify-write (R-M-W)).
The user should keep this in mind when operating on
some special function registers, such as ports.
Note:
Special Function Registers as
Source/Destination
ALUSTA AS DESTINATION
PCL AS SOURCE OR DESTINATION
BIT MANIPULATION
Status bits that are manipulated by the
device (including the Interrupt flag bits) are
set or cleared in the Q1 cycle. So there is
no issue on doing R-M-W instructions on
registers which contain these bits
PCH
PCLATH
8-bit destination value
PCL
PCLATH
8-bit result
ALUSTA will clear register
1997 Microchip Technology Inc.
ALU operand
PCLATH; PCL
PCH;
PCH;
PCL
PCL
dest
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