3 tima counter modulo registers, 4 tima channel status and control registers, Tima counter modulo registers – Freescale Semiconductor MC68HC908MR32 User Manual
Page 228: Tima channel status and control registers
Timer Interface A (TIMA)
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
228
Freescale Semiconductor
16.7.3 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 (TAMODH) inhibits the TOF bit and
overflow interrupts until the low byte (TAMODL) is written. Reset sets the TIMA counter modulo registers.
NOTE
Reset the TIMA counter before writing to the TIMA counter modulo registers.
16.7.4 TIMA Channel Status and Control Registers
Each of the TIMA channel status and control registers:
•
Flags input captures and output compares
•
Enables input capture and output compare interrupts
•
Selects input capture, output compare, or PWM operation
•
Selects high, low, or toggling output on output compare
•
Selects rising edge, falling edge, or any edge as the active input capture trigger
•
Selects output toggling on TIMA overflow
•
Selects 0 percent and 100 percent PWM duty cycle
•
Selects buffered or unbuffered output compare/PWM operation
Register Name and Address:
TAMODH — $0011
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Write:
Reset:
1
1
1
1
1
1
1
1
Register Name and Address:
TAMODL — $0012
Bit 7
6
5
4
3
2
1
Bit 0
Read:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Write:
Reset:
1
1
1
1
1
1
1
1
Figure 16-7. TIMA Counter Modulo Registers
(TAMODH and TAMODL)