UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 188

• 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

188
Note The external clock requires a pulse two cycles longer than internal clock (f
Cautions 1.
Remark f
Address: FF59H
Symbol
PRM02
2.
3.
4.
PRS
: Peripheral hardware clock frequency
Always set data to PRM02 after stopping the timer operation.
If the valid edge of the TI002 pin is to be set for the count clock, do not set the clear & start
mode using the valid edge of the TI002 pin and the capture trigger.
If the TI002 or TI012 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 TI002 pin or TI012 pin to enable the operation of 16-bit timer counter 02
(TM02). Care is therefore required when pulling up the TI002 or TI012 pin. However, when re-
enabling operation for TI002 pin or TI012 pin are high level after the operation has been
stopped, the rising edge is not detected.
When TI012 pin is used valid edge, it cannot be used as the timer output (TO02) to P32, and
when TO02 is used, it cannot be used to the TI012 pin valid edge.
PRM021
ES121
ES121
ES021
7
0
0
1
1
0
0
1
1
0
0
1
1
After reset: 00H
Figure 7-23. Format of Prescaler Mode Register 02 (PRM02)
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
PRM020
ES120
ES020
ES120
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
TI002 valid edge
PRS
PRS
PRS
ES021
/2
/2
User’s Manual U17554EJ4V0UD
5
2
8
ES020
4 MHz
1 MHz
15.62 kHz
Note
f
PRS
4
= 4 MHz
TI012 pin valid edge selection
TI002 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
PRM021
1
20 MHz
5 MHz
78.12 kHz
PRS
PRM020
= 20 MHz
0