UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 219

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(2) Prescaler mode register 0 (PRM0)
Remark f
The count clock of the timer/counter 0, TM0, is specified by the low-order 4 bits of the PRM0 (the high-order 4 bits specify
the count clock of the timer 3, TM3/TM3W).
PRM0 can be read/written with an 8-bit manipulation instruction. The format of the PRM0 is shown in Figure 8-3.
RESET input sets PRM0 to 11H.
PRM0
PRS3
XX
7
: X1 input frequency or oscillation frequency
PRS2
6
PRS1
5
Figure 8-3 Prescaler Mode Register 0 (PRM0) Format
PRS0
4
PRS03
CHAPTER 8 TIMER/COUNTER 0
3
PRS02
2
PRS03 PRS02 PRS01 PRS00
PRS01
Specifies count clock of the TM3/TM3W of the timer 3
(see
0
0
0
0
0
0
0
0
1
1
1
1
Other than the above
Figure
PRS00
0
0
0
0
1
1
1
1
0
0
1
0
11-3).
0FF5CH
Address
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
1
On Reset
External clock (INTP3)
11H
Timer/Counter 0 TM0 Count
Clock Specification
Count Clock [Hz]
Specification
Setting prohibited
fxx/1024
fxx/2048
fxx/128
fxx/256
fxx/512
fxx/16
fxx/32
fxx/64
fxx/8
Setting prohibited
R/W
R/W
(fxx=25MHz)
Resolution
0.32
0.64
1.28
2.56
5.12
10.2
20.5
41.0
81.9
[ s]
–
–
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