MC68HC908AS60ACFN FREESCALE [Freescale Semiconductor, Inc], MC68HC908AS60ACFN Datasheet - Page 317

• Manufacturer Part Number: MC68HC908AS60ACFN
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

25.8 I/O Registers
These I/O registers control and monitor TIMA operation:
25.8.1 TIMA Status and Control Register
The TIMA status and control register:
TOF — TIMA Overflow Flag Bit
TOIE — TIMA Overflow Interrupt Enable Bit
TSTOP — TIMA Stop Bit
Freescale Semiconductor
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This read/write flag is set when the TIMA counter reaches the modulo value programmed in the TIMA
counter modulo registers. Clear TOF by reading the TIMA status and control register when TOF is set
and then writing a logic 0 to TOF. If another TIMA 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.
This read/write bit enables TIMA overflow interrupts when the TOF bit becomes set. Reset clears the
TOIE bit.
This read/write bit stops the TIMA counter. Counting resumes when TSTOP is cleared. Reset sets the
TSTOP bit, stopping the TIMA counter until software clears the TSTOP bit.
1 = TIMA counter has reached modulo value.
0 = TIMA counter has not reached modulo value.
1 = TIMA overflow interrupts enabled
0 = TIMA overflow interrupts disabled
1 = TIMA counter stopped
0 = TIMA counter active
TIMA status and control register (TASC)
TIMA control registers (TACNTH–TACNTL)
TIMA counter modulo registers (TAMODH–TAMODL)
TIMA channel status and control registers (TASC0, TASC1, TASC2, TASC3, TASC4 and TASC5)
TIMA channel registers (TACH0H–TACH0L, TACH1H–TACH1L, TACH2H–TACH2L,
TACH3H–TACH3L, TACH4H–TACH4L and TACH5H–TACH5L)
Enables TIMA overflow interrupts
Flags TIMA overflows
Stops the TIMA counter
Resets the TIMA counter
Prescales the TIMA counter clock
Address:
Reset:
Read:
Write:
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Figure 25-4. TIMA Status and Control Register (TASC)
$0020
Bit 7
TOF
R
0
0
= Reserved
TOIE
6
0
TSTOP
5
1
TRST
4
0
0
R
3
0
0
PS2
2
0
PS1
1
0
Bit 0
PS0
0
I/O Registers
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