UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 280

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

(2) Prescaler mode register 1 (PRM1)
240
Remark f
The count clock of PRM1 to timer/counter 1, TM1/TM1W, is specified by the low-order 4 bits (the high-order 4 bits specify
the count clock to timer/counter 2, TM2/TM2W).
PRM1 can be read or written to with an 8-bit manipulation instruction. The format of the PRM1 is shown in Figure 9-3.
RESET input sets PRM1 to 11H.
PRM1
PRS23
XX
7
: X1 input frequency or oscillation frequency
PRS22
6
PRS21
5
Figure 9-3 Prescaler Mode Register 1 (PRM1) Format
PRS20
4
PRS13
CHAPTER 9 TIMER/COUNTER 1
3
PRS12
2
PRS13 PRS12 PRS11 PRS10
PRS11
Specifies count clock to TM2/TM2W of timer/counter 2
(see Figure 10-3).
0
0
0
0
0
0
0
0
1
1
1
1
Other than the above
PRS10
0
0
0
0
1
1
1
1
0
0
1
0
0FF5EH
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 (INTP0)
11H
16-Bit Timer/Counter 1 TM1/
TM1W 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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