Datasheet

Timer Interface Module (TIM1)
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
236 Freescale Semiconductor
17.8.3 TIM1 Counter Modulo Registers
The read/write TIM1 modulo registers contain the modulo value for the TIM1 counter. When the TIM1
counter reaches the modulo value, the overflow flag (TOF) becomes set, and the TIM1 counter resumes
counting from $0000 at the next timer clock. Writing to the high byte (T1MODH) inhibits the TOF bit and
overflow interrupts until the low byte (T1MODL) is written. Reset sets the TIM1 counter modulo registers.
NOTE
Reset the TIM1 counter before writing to the TIM1 counter modulo registers.
17.8.4 TIM1 Channel Status and Control Registers
Each of the TIM1 channel status and control registers does the following:
• 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 TIM1 overflow
• Selects 0% and 100% PWM duty cycle
• Selects buffered or unbuffered output compare/PWM operation
Address: $0023 T1MODH
Bit 7654321Bit 0
Read:
Bit15 Bit14 Bit13 Bit12 Bit11 Bit10 Bit9 Bit8
Write:
Reset:11111111
Address: $0024 T1MODL
Bit 7654321Bit 0
Read:
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Write:
Reset:11111111
Figure 17-7. TIM1 Counter Modulo Registers (T1MODH:T1MODL)