MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 151

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.5
(1) Timer start errors
(2) 16-bit timer capture/compare register 00 setting
(3) Capture register data retention timing
(4) Valid edge setting
(5) Re-triggering one-shot pulse
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 16-bit timer counter 00 (TM00) is started asynchronously to the count clock.
In the mode in which clear & start occurs on match between TM00 and CR00, set 16-bit timer capture/compare
register 00 (CR00) to other than 0000H. This means a 1-pulse count operation cannot be performed when 16-bit
timer/event counter 00 is used as an external event counter.
The values of 16-bit timer capture/compare registers 00 and 01 (CR00 and CR01) are not guaranteed after 16-bit
timer/event counter 00 has been stopped.
Set the valid edge of the TI000 pin after clearing bits 2 and 3 (TMC002 and TMC003) of 16-bit timer mode control
register 00 (TMC00) to 0, 0, respectively, and then stopping timer operation. The valid edge is set using bits 4
and 5 (ES000 and ES001) of prescaler mode register 00 (PRM00).
(a) One-shot pulse output by software
(b) One-shot pulse output with external trigger
(c) One-shot pulse output function
Cautions for 16-Bit Timer/Event Counter 00
Do not set the OSPT00 bit to 1 again while the one-shot pulse is being output. To output the one-shot pulse
again, wait until the current one-shot pulse output is completed.
Do not input the external trigger again while the one-shot pulse is being output.
To output the one-shot pulse again, wait until the current one-shot pulse output is completed.
When using the one-shot pulse output of 16-bit timer/event counter 00 with a software trigger, do not change
the level of the TI000 pin or its alternate function port pin.
Because the external trigger is valid even in this case, the timer is cleared and started even at the level of the
TI000 pin or its alternate function port pin, resulting in the output of a pulse at an undesired timing.
TM00 count value
Count clock
Figure 7-35. Start Timing of 16-Bit Timer Counter 00 (TM00)
CHAPTER 7 16-BIT TIMER/EVENT COUNTER 00
Timer start
0000H
User’s Manual U17890EJ2V0UD
0001H
0002H
0003H
0004H
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