Datasheet

PIC17C4X
DS30412C-page 70  1996 Microchip Technology Inc.
FIGURE 11-5: TMR0 READ/WRITE IN TIMER MODE
TABLE 11-1: REGISTERS/BITS 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 all
other resets
(Note1)
05h, Unbanked T0STA
INTEDG T0SE T0CS PS3 PS2 PS1 PS0 — 0000 000- 0000 000-
06h, Unbanked CPUSTA — — STKAV GLINTD TO PD — — --11 11-- --11 qq--
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.
Note 1: Other (non power-up) resets include: external reset through MCLR
and the Watchdog Timer Reset.
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
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