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PIC17C752-08/CL Datasheet(PDF) 228 Page - Microchip Technology

Part # PIC17C752-08/CL
Description  High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D
PDF  328 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC17C752-08/CL Datasheet(HTML) 228 Page - Microchip Technology

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PIC17C7XX
DS30289A-page 228
© 1998 Microchip Technology Inc.
TLWT
Table Latch Write
Syntax:
[
label ] TLWT t,f
Operands:
0
≤ f ≤ 255
t
∈ [0,1]
Operation:
If t = 0,
f
→ TBLATL;
If t = 1,
f
→ TBLATH
Status Affected:
None
Encoding:
1010
01tx
ffff
ffff
Description:
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.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process
Data
Write
register
TBLATH or
TBLATL
Example:
TLWT
t, RAM
Before Instruction
t=
0
RAM
=
0xB7
TBLAT
=
0x0000
(TBLATH = 0x00)
(TBLATL = 0x00)
After Instruction
RAM
=
0xB7
TBLAT
=
0x00B7
(TBLATH = 0x00)
(TBLATL = 0xB7)
Before Instruction
t=
1
RAM
=
0xB7
TBLAT
=
0x0000
(TBLATH = 0x00)
(TBLATL = 0x00)
After Instruction
RAM
=
0xB7
TBLAT
=
0xB700
(TBLATH = 0xB7)
(TBLATL = 0x00)
TSTFSZ
Test f, skip if 0
Syntax:
[
label ] TSTFSZ f
Operands:
0
≤ f ≤ 255
Operation:
skip if f = 0
Status Affected:
None
Encoding:
0011
0011
ffff
ffff
Description:
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.
Words:
1
Cycles:
1 (2)
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process
Data
No
operation
If skip:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
No
operation
Example:
HERE
TSTFSZ
CNT
NZERO
:
ZERO
:
Before Instruction
PC = Address (HERE)
After Instruction
If CNT
=
0x00,
PC
=
Address (ZERO)
If CNT
≠
0x00,
PC
=
Address (NZERO)



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