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9.5.4 Control register
(1) Timer control register 4 (TMC4)
The TMC4 register controls the operation of timer 4.
This register can be read/written in 8-bit or 1-bit units.
Caution The TM4CAE0 bit and other bits cannot be set at the same time.
TM4CAE0 bit and then set the other bits and the other registers of TM4.
7
6
TMC4
0
CS2
Bit position
Bit name
6 to 4
CS2 to CS0
1
TM4CE0
0
TM4CAE0
400
CHAPTER 9 TIMER/COUNTER FUNCTION
5
4
3
CS1
CS0
0
Selects the TM4 count clock.
CS2
CS1
CS0
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Caution Do not change the CS2 to CS0 bits during timer operation. If they
are to be changed, they must be changed after setting the TM4CE0
bit to 0. If the CS2 to CS0 bits are overwritten during timer
operation, the operation is not guaranteed.
Controls the operation of TM4.
0: Count disabled (timer stopped at 0000H and does not operate)
1: Count operation performed
Caution The TM4CE0 bit is not cleared even if a match is detected by the
compare operation. To stop the count operation, clear the TM4CE0
bit.
Controls the internal count clock.
0: Entire TM4 unit asynchronously reset. Base clock (f
stopped.
1: Base clock (f
) supplied to TM4 unit.
CLK
Cautions 1. When TM4CAE0 = 0 is set, the TM4 unit can be reset
asynchronously.
2. When TM4CAE0 = 0, the TM4 unit is in a reset state. To operate
TM4, first set TM4CAE0 = 1.
3. When the TM4CAE0 bit is changed from 1 to 0, all the registers
of the TM4 unit are initialized. When again setting TM4CAE0 =
1, be sure to then set all the registers of the TM4 unit again.
User's Manual U15195EJ5V0UD
2
<1>
<0>
0
TM4CE0
TM4CAE0
Function
Count clock
0
f
/4
XX
1
f
/8
XX
0
f
/16
XX
1
f
/32
XX
0
f
/64
XX
1
f
/128
XX
0
f
/256
XX
1
f
/512
XX
Be sure to set the
Address
After reset
FFFFF544H
00H
) supply to TM4 unit
CLK
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