8-Bit Timer Counter Control Register - NEC mPD17120 Subseries User Manual

13.1.2 8-bit Timer Counter Control Register

There are two types of 8-bit timer counter control registers; timer mode register and timer carry output control
mode register.
Figures 13-2 and 13-3 show the configuration of 8-bit timer counter control registers.
RF: 11H
Bit 3
TMEN
Read/write
1
Initial value when reset
CHAPTER 13 PERIPHERAL HARDWARE
Figure 13-2. Timer Mode Register
Bit 2 Bit 1 Bit 0
TMRES TMCK1 TMCK0
R/W
0 0 0
TMCK1
TMRES
Remark TMRES is automatically cleared (0) when set (1).
Remark TMEN can be used as the status flag which detects
Read=R, write=W
TMCK0 Source Clock Selection
0 0 fx /256
0 1 fx /32
1 0 fx /2048
1 1 External clock from INT pin
Timer Reset
0 No influence to timer
1 Reset count register (TMC) and IRQTM
When reading it, 0 is always read.
TMEN Timer Start Instruction
0 Stop timer counting.
1 Start timer counting.
the count state of the timer (0 : count stop, 1 : counting).
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