NEC 78K0 Series User Manual page 267

Figure 9-5. Format of 8-Bit Timer H Mode Register 0 (TMHMD0)
Address: FF69H
TMHMD0 TMHE0
TMHE0
CKS02
TMMD01
Other than above
TOLEV0
TOEN0
Note Note the following points when selecting the TM50 output as the count clock.
• Mode in which the count clock is cleared and started upon a match of TM50 and CR50 (TMC506 = 0)
Start the operation of the 8-bit timer/event counter 50 first and then enable the timer F/F inversion
operation (TMC501 = 1).
• PWM mode (TMC506 = 1)
Start the operation of the 8-bit timer/event counter 50 first and then set the count clock to make the duty =
50%.
It is not necessary to enable the TO50 pin as a timer output pin in any mode.
CHAPTER 9 8-BIT TIMERS H0 AND H1
After reset: 00H R/W
<7> 5
6
CKS02 CKS01
0
Stops timer count operation (counter is cleared to 0)
1 Enables timer count operation (count operation started by inputting clock)
CKS01 CKS00
0 0 0
f
PRS
0 0 1
f
PRS
0 1 0
f
PRS
0 1 1 f
PRS
1 0 0
f
PRS
1 0 1
TM50 output
Other than above
Setting prohibited
TMMD00
0 0 Interval timer mode
1 0
PWM output mode
Setting prohibited
Timer output level control (in default mode)
0
Low level
1 High level
0 Disables output
1 Enables output
Preliminary User's Manual U17260EJ3V1UD
3 2
4
CKS00 TMMD01 TMMD00 TOLEV0
Timer operation enable
Count clock selection
f = f =
PRS PRS
2 MHz 5 MHz
2 MHz 5 MHz
1 MHz 2.5 MHz
/2
2
/2 500 kHz 1.25 MHz
6
/2 31.25 kHz 78.13 kHz
10
1.95 kHz 4.88 kHz
/2
Note
Timer operation mode
Timer output control
<1> <0>
TOEN0
f = f =
PRS PRS
10 MHz 20 MHz
10 MHz 20 MHz
5 MHz 10 MHz
2.5 MHz 5 MHz
156.25 kHz 312.5 kHz
9.77 kHz 19.54 kHz
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