Datasheet

PIC17C7XX
DS30289C-page 100  1998-2013 Microchip Technology Inc.
FIGURE 12-4: TMR0 READ/WRITE IN TIMER MODE
TABLE 12-1: REGISTERS/BITS ASSOCIATED WITH TIMER0
Instruction
Executed
MOVFP
DATAL,TMR0L
Write TMR0L
MOVFP
DATAH,TMR0H
Write TMR0H
MOVPF
TMR0L,W
Read TMR0L
MOVPF
TMR0L,W
Read TMR0L
MOVPF
TMR0L,W
Read TMR0L
Q1 Q2 Q3 Q4
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
AD15:AD0
ALE
WR_TRM0L
WR_TMR0H
RD_TMR0L
TMR0H
TMR0L
12
12
13
AB
FE
FF
56
57 58
Note: In this example, old TMR0 value is 12FEh, new value of AB56h is written.
Instruction
Fetched
MOVFP
DATAL,TMR0L
Write TMR0L
MOVFP
DATAH,TMR0H
Write TMR0H
MOVPF
TMR0L,W
Read TMR0L
MOVPF
TMR0L,W
Read TMR0L
MOVPF
TMR0L,W
Read TMR0L
MOVPF
TMR0L,W
Read TMR0L
Previously
Fetched
Instruction
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
POR,
BOR
MCLR, WDT
05h, Unbanked T0STA
INTEDG T0SE T0CS T0PS3 T0PS2 T0PS1 T0PS0 —
0000 000- 0000 000-
06h, Unbanked CPUSTA
— — STKAV GLINTD TO PD POR BOR
--11 11qq --11 qquu
07h, Unbanked INTSTA
PEIF T0CKIF T0IF INTF PEIE T0CKIE T0IE INTE
0000 0000 0000 0000
0Bh, Unbanked TMR0L TMR0 Register; Low Byte
xxxx xxxx uuuu uuuu
0Ch, Unbanked TMR0H TMR0 Register; High Byte
xxxx xxxx uuuu uuuu
Legend: x = unknown, u = unchanged, - = unimplemented, read as a '0', q = value depends on condition. Shaded cells are not used by Timer0.