UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 186

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

186
Note The external clock requires a pulse two cycles longer than internal clock (f
Cautions 1.
Remark f
Address: FFBBH
Symbol
PRM00
2.
3.
4.
PRS
: Peripheral hardware clock frequency
Always set data to PRM00 after stopping the timer operation.
If the valid edge of the TI000 pin is to be set for the count clock, do not set the clear & start
mode using the valid edge of the TI000 pin and the capture trigger.
If the TI000 or TI010 pin is high level immediately after system reset, the rising edge is
immediately detected after the rising edge or both the rising and falling edges are set as the
valid edge(s) of the TI000 pin or TI010 pin to enable the operation of 16-bit timer counter 00
(TM00). Care is therefore required when pulling up the TI000 or TI010 pin. However, when re-
enabling operation for TI000 pin or TI010 pin are high level after the operation has been
stopped, the rising edge is not detected.
When TI010 pin is used valid edge, it cannot be used as the timer output (TO00) to P01, and
when TO00 is used, it cannot be used to the TI010 pin valid edge.
PRM001
ES101
ES101
ES001
7
0
0
1
1
0
0
1
1
0
0
1
1
After reset: 00H
Figure 7-21. Format of Prescaler Mode Register 00 (PRM00)
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
PRM000
ES100
ES000
ES100
6
0
1
0
1
0
1
0
1
0
1
0
1
R/W
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 valid edge
PRS
PRS
PRS
ES001
/2
/2
User’s Manual U17554EJ4V0UD
5
2
8
ES000
4 MHz
1 MHz
15.62 kHz
Note
f
PRS
4
= 4 MHz
TI010 pin valid edge selection
TI000 pin valid edge selection
Count clock selection
3
0
5 MHz
1.25 MHz
19.53 kHz
f
PRS
= 5 MHz
2
0
PRS
39.06 kHz
f
10 MHz
2.5 MHz
PRS
).
= 10 MHz f
PRM001
1
20 MHz
5 MHz
78.12 kHz
PRS
PRM000
= 20 MHz
0