PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 140

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

PIC17C4X
TLWT
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Example:
DS30412C-page 140
Before Instruction
After Instruction
Before Instruction
After Instruction
Decode
t
RAM
TBLAT
RAM
TBLAT
t
RAM
TBLAT
RAM
TBLAT
Q1
=
=
=
=
=
=
=
=
=
=
register 'f'
Table Latch Write
[ label ] TLWT t,f
0
t
If t = 0,
If t = 1,
Data from file register 'f' is written into
the 16-bit table latch (TBLAT).
If t = 1; high byte is written
If t = 0; low byte is written
This instruction is used in conjunction
with TABLWT to transfer data from data
memory to program memory.
1
1
TLWT
None
Read
1010
Q2
f
f
0
0xB7
0x0000
0xB7
0x00B7
1
0xB7
0x0000
0xB7
0xB700
[0,1]
f
255
TBLATL;
TBLATH
t, RAM
01tx
(TBLATL = 0x00)
(TBLATL = 0xB7)
(TBLATL = 0x00)
(TBLATL = 0x00)
(TBLATH = 0x00)
(TBLATH = 0x00)
(TBLATH = 0x00)
(TBLATH = 0xB7)
Execute
Q3
ffff
TBLATH or
TBLATL
register
Write
Q4
ffff
TSTFSZ
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
If skip:
Example:
Before Instruction
After Instruction
Forced NOP
Decode
PC = Address(HERE)
If CNT
If CNT
Q1
Q1
PC
PC
register 'f'
Test f, skip if 0
[ label ] TSTFSZ f
0
skip if f = 0
None
If 'f' = 0, the next instruction, fetched
during the current instruction execution,
is discarded and an NOP is executed
making this a two-cycle instruction.
1
1 (2)
HERE
NZERO
ZERO
Read
NOP
0011
Q2
Q2
=
=
=
f
1996 Microchip Technology Inc.
255
0x00,
Address (ZERO)
0x00,
Address (NZERO)
:
TSTFSZ
:
0011
Execute
Execute
Q3
Q3
CNT
ffff
NOP
NOP
Q4
Q4
ffff