MC68HC908MR8 Datasheet, PDF (217/372 Pages) Motorola, Inc – Microcontrollers

Timer Interface A (TIMA)
I/O Registers
11.10.3 TIMA Counter Modulo Registers
The read/write TIMA modulo registers contain the modulo value for the
TIMA counter. When the TIMA counter reaches the modulo value, the
overflow flag (TOF) becomes set, and the TIMA counter resumes
counting from $0000 at the next timer clock. Writing to the high byte
(TMODH) inhibits the TOF bit and overflow interrupts until the low byte
(TMODL) is written. Reset sets the TIMA counter modulo registers.
Register Name and Ad-
dress:
TAMODH — $0011
Bit 7
6
5
4
3
Read:
Bit 15
Write:
Bit 14
Bit 13
Bit 12
Bit 11
Reset: 1
1
1
1
1
2
Bit 10
1
1
Bit 9
1
Bit 0
Bit 8
1
Register Name and Ad-
dress:
TAMODL — $0012
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Write:
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset: 1
1
1
1
1
1
1
1
Figure 11-6. TIMA Counter Modulo Registers (TMODH and TMODL)
NOTE: Reset the TIMA counter before writing to the TIMA counter modulo
registers.
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Timer Interface A (TIMA)
Technical Data
217