upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 174

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

6.6 Cautions for 16-Bit Timer/Event Counter 00
(1) Restrictions for each channel of 16-bit timer/event counter 00
(2) Timer start errors
(3) Setting of CR000 and CR010 (clear & start mode entered upon a match between TM00 and CR000)
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As interval timer
As square wave output
As external event counter
As clear & start mode entered by
TI000 pin valid edge input
As free-running timer
As PPG output
As one-shot pulse output
As pulse width measurement
Table 6-3 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 TM00 is started asynchronously to the count pulse.
Set a value other than 0000H to CR000 and CR010 (TM00 cannot count one pulse when it is used as an external
event counter).
Operation
Table 6-3. Restrictions for Each Channel of 16-Bit Timer/Event Counter 00
TM00 count value
Count pulse
TOC00 = 00H
Using timer output (TO00) is prohibited when detection of the valid edge of the TI010 pin is
used.
TOC00 = 00H
Setting identical values or 0000H to CR000 and CP010 is prohibited.
TOC00 = 00H
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Figure 6-55. Start Timing of TM00 Count
Preliminary User’s Manual U19014EJ1V0UD
Timer start
0000H
0001H
0002H
Restriction
−
−
−
0003H
0004H