MC68HC908AT32 Datasheet, PDF (214/378 Pages) Freescale Semiconductor, Inc – Microcontrollers

Timer Interface (TIMB)
19.8.3 TIMB Counter Modulo Registers
The read/write TIMB modulo registers contain the modulo value for the TIMB counter. When the TIMB
counter reaches the modulo value, the overflow flag (TOF) becomes set, and the TIMB 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 TIMB counter modulo registers.
Register Name and Address: TBMODH — $0043
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: TBMODL — $0044
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 19-6. TIMB Counter Modulo Registers (TMODH and TMODL)
NOTE
Reset the TIMB counter before writing to the TIMB counter modulo registers.
19.8.4 TIMB Channel Status and Control Registers
Each of the TIMB 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 TIMB overflow
• Selects 100 percent PWM duty cycle
• Selects buffered or unbuffered output compare/PWM operation
MC68HC908AT32 Data Sheet, Rev. 3.1
214
Freescale Semiconductor