UPD78F0138 NEC, UPD78F0138 Datasheet - Page 204

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

7.5 Cautions for 8-Bit Timer/Event Counters 50 and 51
(1) Timer start error
204
Remark n = 0, 1
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 8-bit timer counters 50 and 51 (TM50, TM51) are started asynchronously to the count clock.
TM5n count value
Count clock
CHAPTER 7 8-BIT TIMER/EVENT COUNTERS 50 AND 51
Figure 7-16. 8-Bit Timer Counter 5n Start Timing
00H
Timer start
User’s Manual U16228EJ2V0UD
01H
02H
03H
04H