MC68HC908AT32 Datasheet, PDF (224/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Modulo Timer (TIM)
20.7.3 TIM Counter Modulo Registers
The read/write TIM modulo registers contain the modulo value for the TIM counter. When the TIM counter
reaches the modulo value, the overflow flag (TOF) becomes set, and the TIM counter resumes counting
from $0000 at the next clock. Writing to the high byte (TMODH) inhibits the TOF bit and overflow interrupts
until the low byte (TMODL) is written. Reset sets the TIM counter modulo registers.
Register and Address: TMODH — $004E
Bit 7
6
5
4
3
2
Read:
Bit 15
14
13
12
11
10
Write:
Reset: 1
1
1
1
1
1
1
Bit 0
9
Bit 8
1
1
Register and Address: TMODL — $004F
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset: 1
1
1
1
1
1
1
1
Figure 20-5. TIM Counter Modulo Registers (TMODH–TMODL)
NOTE
Reset the TIM counter before writing to the TIM counter modulo registers.
MC68HC908AT32 Data Sheet, Rev. 3.1
224
Freescale Semiconductor