UPD78F9234MC-5A4-A Datasheet, PDF (99/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
(4) Prescaler mode register 00 (PRM00)
This register is used to set the 16-bit timer counter 00 (TM00) count clock and the TI000, TI010 pin input valid
edges.
PRM00 is set by a 1-bit or 8-bit memory manipulation instruction.
Generation of reset signal sets the value of PRM00 to 00H.
Figure 6-8. Format of Prescaler Mode Register 00 (PRM00)
Address: FF61H After reset: 00H R/W
Symbol
7
6
5
4
3
PRM00
ES110
ES100
ES010
ES000
0
2
1
0
0
PRM001 PRM000
ES110
0
0
1
1
ES100
0
1
0
1
TI010 pin valid edge selection
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
ES010
0
0
1
1
ES000
0
1
0
1
TI000 pin valid edge selection
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
PRM001
0
0
1
1
PRM000
0
1
0
1
fXP (10 MHz)
fXP/2² (2.5 MHz)
fXP/2⁸ (39.06 kHz)
TI000 pin valid edge^Note
Count clock selection
Remarks 1. fXP: Oscillation frequency of clock supplied to peripheral hardware
2. ( ): fXP = 10 MHz
Note The external clock requires a pulse longer than two cycles of the internal count clock (fXP).
User’s Manual U17446EJ5V0UD
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