UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 93

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

(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.
Reset signal generation sets the value of PRM00 to 00H.
Remarks 1. f
Note The external clock requires a pulse longer than two cycles of the internal count clock (f
Address: FF61H After reset: 00H R/W
Symbol
PRM00
2. ( ): f
XP
PRM001
ES110
ES110
ES010
: Oscillation frequency of clock supplied to peripheral hardware
7
0
0
1
1
0
0
1
1
0
0
1
1
XP
Figure 6-8. Format of Prescaler Mode Register 00 (PRM00)
= 10 MHz
PRM000
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
ES100
ES100
ES000
0
1
0
1
0
1
0
1
0
1
0
1
6
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
Falling edge
Rising edge
Setting prohibited
Both falling and rising edges
f
f
f
TI000 pin valid edge
XP
XP
XP
User’s Manual U16898EJ5V0UD
ES010
/2
/2
(10 MHz)
2
8
5
(2.5 MHz)
(39.06 kHz)
ES000
4
Note
TI010 pin valid edge selection
TI000 pin valid edge selection
Count clock selection
3
0
2
0
PRM001
1
XP
).
PRM000
0
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