UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 187

• 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

Note The external clock requires a pulse two cycles longer than internal clock (f
Cautions 1.
Remark f
Address: FFB7H
Symbol
PRM01
2.
3.
4.
PRS
: Peripheral hardware clock frequency
Always set data to PRM01 after stopping the timer operation.
If the valid edge of the TI001 pin is to be set for the count clock, do not set the clear & start
mode using the valid edge of the TI001 pin and the capture trigger.
If the TI001 or TI011 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 TI001 pin or TI011 pin to enable the operation of 16-bit timer counter 01
(TM01). Care is therefore required when pulling up the TI001 or TI011 pin. However, when re-
enabling operation for TI001 pin or TI011 pin are high level after the operation has been
stopped, the rising edge is not detected.
When TI011 pin is used valid edge, it cannot be used as the timer output (TO01) to P06, and
when TO01 is used, it cannot be used to the TI011 pin valid edge.
PRM011
ES111
ES111
ES011
7
0
0
1
1
0
0
1
1
0
0
1
1
After reset: 00H
Figure 7-22. Format of Prescaler Mode Register 01 (PRM01)
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
PRM010
ES110
ES010
ES110
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
TI001 valid edge
PRS
PRS
PRS
ES011
/2
/2
User’s Manual U17554EJ4V0UD
5
4
6
ES010
4 MHz
250 kHz
62.5 kHz
Note
f
PRS
4
= 4 MHz
TI011 pin valid edge selection
TI001 pin valid edge selection
Count clock selection
3
0
5 MHz
312.5 kHz
78.125 kHz
f
PRS
= 5 MHz
2
0
PRS
10 MHz
625 kHz
156.25 kHz
f
PRS
).
= 10 MHz f
PRM011
1
20 MHz
1.25 MHz
312.5 kHz
PRS
PRM010
= 20 MHz
0
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