PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 138

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

PIC17C4X
TABLRD
Example1:
Example2:
DS30412C-page 138
Before Instruction
After Instruction (table write completion)
Before Instruction
After Instruction (table write completion)
REG
TBLATH
TBLATL
TBLPTR
MEMORY(TBLPTR)
REG
TBLATH
TBLATL
TBLPTR
MEMORY(TBLPTR)
REG
TBLATH
TBLATL
TBLPTR
MEMORY(TBLPTR)
REG
TBLATH
TBLATL
TBLPTR
MEMORY(TBLPTR)
Table Read
TABLRD
TABLRD
1, 1, REG ;
0, 0, REG ;
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
0x53
0xAA
0x55
0xA356
0x1234
0xAA
0x12
0x34
0xA357
0x5678
0x53
0xAA
0x55
0xA356
0x1234
0x55
0x12
0x34
0xA356
0x1234
TABLWT
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Note:
Decode
Q1
The MCLR/V
voltage for successful programming of internal
memory.
If MCLR/V
the programming sequence of internal memory
will be executed, but will not be successful
(although the internal memory location may be
disturbed)
register 'f'
PP
Table Write
[ label ] TABLWT t,i,f
0
i
t
If t = 0,
If t = 1,
If i = 1,
None
1.
2.
3.
1
2 (many if write is to on-chip
EPROM program memory)
Read
1010
PP
= V
Q2
f
f
TBLAT
TBLPTR + 1
[0,1]
[0,1]
f
Load value in ’f’ into 16-bit table
latch (TBLAT)
If t = 0: load into low byte;
If t = 1: load into high byte
The contents of TBLAT is written
to the program memory location
pointed to by TBLPTR
If TBLPTR points to external
program memory location, then
the instruction takes two-cycle
If TBLPTR points to an internal
EPROM
instruction is terminated when
an interrupt is received.
The TBLPTR can be automati-
cally incremented
If i = 0; TBLPTR is not
If i = 1; TBLPTR is incremented
pin must be at the programming
DD
1996 Microchip Technology Inc.
255
TBLATL;
TBLATH;
11ti
incremented
Execute
Prog Mem (TBLPTR);
location,
Q3
TBLPTR
ffff
then
TBLATH or
TBLATL
register
Write
Q4
ffff
the