PIC12CE67 Microchip Technology, PIC12CE67 Datasheet - Page 32

• Manufacturer Part Number: PIC12CE67
• Description: 8-Pin/ 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
• Manufacturer: Microchip Technology

PIC12CE67X
FIGURE 7-3:
FIGURE 7-4:
DS40181B-page 32
Instruction
PC
(Program
Counter)
Fetch
Instruction
Execute
TMR0
INSTRUCTION
FLOW
GIE bit
(INTCON<7>)
T0IF bit
(INTCON<2>)
Instruction
fetched
Instruction
executed
Timer0
CLKOUT(3)
OSC1
PC
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
Note 1: Interrupt flag bit T0IF is sampled here (every Q1).
T0
PC-1
Q1
2: Interrupt latency = 3Tcy where Tcy = instruction cycle time.
3: CLKOUT is available only in RC oscillator mode.
TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2
TIMER0 INTERRUPT TIMING
FEh
Inst (PC)
Inst (PC-1)
Q2
1
PC
MOVWF TMR0
Q3
PC
T0+1
Q4
Q1
MOVF TMR0,W
FFh
Write TMR0
executed
Inst (PC+1)
Inst (PC)
PC+1
Q2
1
PC +1
Q3
MOVF TMR0,W MOVF TMR0,W
Preliminary
Q4
Read TMR0
reads NT0
PC+2
Q1
00h
Dummy cycle
Q2
PC +1
Read TMR0
reads NT0
PC+3
Q3
NT0
Q4
MOVF TMR0,W
Read TMR0
reads NT0
Q1
PC+4
01h
Dummy cycle
Inst (0004h)
Q2
0004h
Q3
MOVF TMR0,W
Read TMR0
reads NT0
1998 Microchip Technology Inc.
PC+5
Q4
Q1
02h
Read TMR0
reads NT0 + 1
Inst (0004h)
Inst (0005h)
NT0+1
Q2
0005h
PC+6
Q3
Q4