mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 208
mc68hc908gp32
Manufacturer Part Number
mc68hc908gp32
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908GP32.pdf
(266 pages)
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Timer Interface Module (TIM)
17.8 I/O Signals
Port D shares four of its pins with the TIM. The four TIM channel I/O pins are T1CH0, T1CH1, T2CH0,
and T2CH1 as described in
Each channel I/O pin is programmable independently as an input capture pin or an output compare pin.
T1CH0 and T2CH0 can be configured as buffered output compare or buffered PWM pins.
17.9 I/O Registers
These I/O registers control and monitor operation of the TIM:
17.9.1 TIM Status and Control Register
The TIM status and control register (TSC):
TOF — TIM Overflow Flag Bit
208
•
•
•
•
•
•
•
•
•
•
This read/write flag is set when the TIM counter reaches the modulo value programmed in the TIM
counter modulo registers. Clear TOF by reading the TIM status and control register when TOF is set
and then writing a logic 0 to TOF. If another TIM overflow occurs before the clearing sequence is
complete, then writing logic 0 to TOF has no effect. Therefore, a TOF interrupt request cannot be lost
due to inadvertent clearing of TOF. Reset clears the TOF bit. Writing a logic 1 to TOF has no effect.
1 = TIM counter has reached modulo value
0 = TIM counter has not reached modulo value
TIM status and control register (TSC)
TIM counter registers (TCNTH:TCNTL)
TIM counter modulo registers (TMODH:TMODL)
TIM channel status and control registers (TSC0, TSC1)
TIM channel registers (TCH0H:TCH0L, TCH1H:TCH1L)
Enables TIM overflow interrupts
Flags TIM overflows
Stops the TIM counter
Resets the TIM counter
Prescales the TIM counter clock
Address: T1SC, $0020 and T2SC, $002B
References to either timer 1 or timer 2 may be made in the following text by
omitting the timer number. For example, TSC may generically refer to both
T1SC AND T2SC.
Reset:
Read:
Write:
Bit 7
TOF
Figure 17-4. TIM Status and Control Register (TSC)
0
0
17.3 Pin Name
= Unimplemented
TOIE
6
0
MC68HC908GP32 Data Sheet, Rev. 10
TSTOP
5
1
Conventions.
NOTE
TRST
4
0
0
3
0
0
PS2
2
0
PS1
1
0
Freescale Semiconductor
Bit 0
PS0
0
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