UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 218

• 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

7.6 Cautions for 16-Bit Timer/Event Counters 00 to 03
(1) Restrictions for each channel of 16-bit timer/event counter 0n
(2) Timer start errors
(3) Setting of CR00n and CR01n (clear & start mode entered upon a match between TM0n and CR00n)
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As interval timer
As square-wave output
As external event counter
As clear & start mode entered by
TI00n pin valid edge input
As free-running timer
As PPG output
As one-shot pulse output
As pulse width measurement
Table 7-5 shows the restrictions for each channel.
An error of up to one clock may occur in the time required for a match signal to be generated after timer start.
This is because counting TM0n is started asynchronously to the count pulse.
Set a value other than 0000H to CR00n and CR01n (TM0n cannot count one pulse when it is used as an external
event counter).
Remark n = 0 to 3
Operation
Table 7-5. Restrictions for Each Channel of 16-Bit Timer/Event Counter 0n
TM0n count value
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 03
Count pulse
Using timer output (TO0n) is prohibited when detection of the valid edge of the TI01n pin is
used. (TOC0n = 00H)
0000H ≤ CP01n < CR00n ≤ FFFFH
Setting the same value to CR00n and CP01n is prohibited.
Using timer output (TO0n) is prohibited (TOC0n = 00H)
Figure 7-55. Start Timing of TM0n Count
Timer start
User’s Manual U17554EJ4V0UD
0000H
0001H
0002H
Restriction
−
−
0003H
0004H