upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 123

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(4) Prescaler mode register 00 (PRM00)
Note The external clock requires a pulse two cycles longer than internal clock (f
Remark f
PRM00 is the register that sets the TM00 count clock and TI000 and TI010 pin input valid edges.
Rewriting PRM00 is prohibited during operation (when TMC003 and TMC002 = other than 00).
PRM00 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PRM00 to 00H.
Cautions 1. Do not apply the following setting when setting the PRM001 and PRM000 bits to 11 (to
Symbol
PRM00
Address: FFBBH
PRS
2. If the operation of the 16-bit timer/event counter 00 is enabled when the TI000 or TI010 pin is
3. The valid edge of TI010 and timer output (TO00) cannot be used for the P01 pin at the same
: Peripheral hardware clock frequency
PRM001
specify the valid edge of the TI000 pin as a count clock).
• Clear & start mode entered by the TI000 pin valid edge
• Setting the TI000 pin as a capture trigger
at high level and when the valid edge of the TI000 or TI010 pin is specified to be the rising
edge or both edges, the high level of the TI000 or TI010 pin is detected as a rising edge.
Note this when the TI000 or TI010 pin is pulled up. However, the rising edge is not detected
when the timer operation has been once stopped and then is enabled again.
time. Select either of the functions.
ES101
ES101
ES001
7
0
0
1
1
0
0
1
1
0
0
1
1
After reset: 00H
Figure 6-9. Format of Prescaler Mode Register 00 (PRM00)
PRM000
ES100
ES000
ES100
6
0
1
0
1
0
1
0
1
0
1
0
1
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
R/W
Preliminary User’s Manual U19014EJ1V0UD
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
f
f
Setting prohibited
TI000 valid edge
PRS
PRS
ES001
/2
5
2
ES000
12 MHz
3 MHz
Note
4
f
TI010 pin valid edge selection
TI000 pin valid edge selection
PRS
= 12 MHz
Count clock selection
3
0
2
0
PRS
16 MHz
4 MHz
).
PRM001
f
PRS
1
= 16 MHz
PRM000
0
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