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P12C508 Datasheet(PDF) 22 Page - Microchip Technology

Part # P12C508
Description  8-Pin, 8-Bit CMOS Microcontroller
PDF  84 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

P12C508 Datasheet(HTML) 22 Page - Microchip Technology

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PIC12C5XX
DS40139A-page 22
Advance Information
© 1996 Microchip Technology Inc.
FIGURE 6-2:
TIMER0 TIMING: INTERNAL CLOCK/NO PRESCALE
FIGURE 6-3:
TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2
TABLE 6-1:
REGISTERS ASSOCIATED WITH TIMER0
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
Power-On
Reset
Value on
MCLR and
WDT Reset
Value on
Wake-up on
Pin Change
01h
TMR0
Timer0 - 8-bit real-time clock/counter
xxxx xxxx uuuu uuuu uuuu uuuu
N/A
OPTION GPWU GPPU T0CS T0SE PSA
PS2
PS1
PS0 1111 1111 1111 1111 1111 1111
N/A
TRIS
I/O control registers
--11 1111 --11 1111 --11 1111
Legend: Shaded cells not used by Timer0, - = unimplemented, x = unknown, u = unchanged,
PC-1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC
(Program
Counter)
Instruction
Fetch
Timer0
PC
PC+1
PC+2
PC+3
PC+4
PC+5
PC+6
T0
T0+1
T0+2
NT0
NT0
NT0
NT0+1
NT0+2
MOVWF TMR0
MOVF TMR0,W
MOVF TMR0,W MOVF TMR0,W
MOVF TMR0,W
MOVF TMR0,W
Write TMR0
executed
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0 + 1
Read TMR0
reads NT0 + 2
Instruction
Executed
PC-1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC
(Program
Counter)
Instruction
Fetch
Timer0
PC
PC+1
PC+2
PC+3
PC+4
PC+5
PC+6
T0
NT0+1
MOVWF TMR0
MOVF TMR0,W
MOVF TMR0,W MOVF TMR0,W
MOVF TMR0,W
MOVF TMR0,W
Write TMR0
executed
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0
Read TMR0
reads NT0 + 1
T0+1
NT0
Instruction
Execute
T0



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