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CHAPTER 12 16-BIT RELOAD TIMER
12.2 Control Status Register (TMCSR)
The control status register is used to control the 16-bit timer operation mode and
interrupts.
Set the bits other than UF, CNTE, and TRG again when CNTE is 0.
Simultaneous writing is enabled.
■
Configuration of Control Status Register (TMCSR)
The configuration of the control status register (TMCSR) is shown below:
■
Bit Functions of Control Status Register (TMCSR)
[bits 11, 10] CSL1, CSL0 (Count clock SLect)
These bits are used to select the count clock.
Table 12.2-1 lists the clock sources that can be selected.
[bits 9, 8, 7] MOD2, MOD1, MOD0 (MODe)
These bits specify the operation mode.
Always set these bits to "0".
[bit 6] OUTE (OUTput Enable)
Always set this bit to "0".
[bit 5] OUTL
Always set this bit to "0".
[bit 4] RELD
This is a reload enable bit. Setting this bit to "1" enables the reload mode. When the
counter value underflows from 0000
H
to FFFF
H
in reload mode, the value in the reload
register is loaded to the counter and the counter continues counting. When the counter
value underflows 0000
H
to FFFF
H
while the bit is "0", the counter stops counting.
11109876543210
TMCSR
Address:00002E
H
CSL1 CSL0 MOD2 MOD1 MOD0 OUTE OUTL RELD INTE UF CNTE TRG
000036
H
-000
H
000042
H
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value
Table 12.2-1 CSL Bit Setting Clock Source
CSL1 CSL0 Clock source (
φ:
φ:φ:
φ:
machine clock)
00
φ
/2
1
01
φ
/2
3
10
φ
/2
5
11 Reserved