upd78f0124m6gba1-8et Renesas Electronics Corporation., upd78f0124m6gba1-8et Datasheet - Page 139

• Manufacturer Part Number: upd78f0124m6gba1-8et
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(4) Prescaler mode register 00 (PRM00)
Notes 1.
This register is used to set the 16-bit timer counter 00 (TM00) count clock and TI000 and TI010 input valid edges.
PRM00 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears PRM00 to 00H.
Address: FFBBH
Symbol
PRM00
2.
Set the count clock to satisfy the following conditions.
• V
• V
• V
• V
The external clock requires a pulse longer than two cycles of the internal clock (f
DD
DD
DD
DD
PRM001
ES101
ES101
ES001
= 4.0 to 5.5 V: Count clock ≤ 10 MHz
= 3.3 to 4.0 V: Count clock ≤ 8.38 MHz
= 2.7 to 3.3 V: Count clock ≤ 5 MHz
= 2.5 to 2.7 V: Count clock ≤ 2.5 MHz
7
0
0
1
1
0
0
1
1
0
0
1
1
After reset: 00H
Figure 6-8. 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
Falling edge
Rising edge
Setting prohibited
Both rising and falling edges
Falling edge
Rising edge
Setting prohibited
Both rising and falling edges
f
f
f
TI000 valid edge
X
X
X
/2
/2
(10 MHz)
ES001
2
8
(2.5 MHz)
(39.06 kHz)
User’s Manual U16315EJ3V1UD
5
ES000
Note 2
4
TI010 valid edge selection
TI000 valid edge selection
Count clock selection
3
0
2
0
Note 1
PRM001
1
X
).
PRM000
0
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