Renesas M32R/ECU Series User Manual page 815

Appendix 4
Appendix 4.8.7 Precautions on Using TIO Delayed Single-Shot Output Mode
The following describes precautions to be observed when using TIO delayed single-shot output mode.
• If the counter stops due to an underflow in the same clock period as the timer is enabled by external input,
the former has priority so that the counter stops.
• If the counter stops due to an underflow in the same clock period as count is enabled by writing to the enable
bit, the latter has priority so that count is enabled.
• If the timer is enabled by external input in the same clock period as count is disabled by writing to the enable
bit, the latter has priority so that count is disabled.
• If the counter is accessed for read immediately after being reloaded pursuant to an underflow, the counter
value temporarily reads as H'FFFF but immediately changes to (reload value – 1) at the next clock edge.
Appendix 4.8.8 Precautions on Using TIO Continuous Output Mode
The following describes precautions to be observed when using TIO continuous output mode.
• If the timer is enabled by external input in the same clock period as count is disabled by writing to the enable
bit, the latter has priority so that count is disabled.
• If the counter is accessed for read immediately after being reloaded pursuant to an underflow, the counter
value temporarily reads as H'FFFF but immediately changes to (reload value – 1) at the next clock edge.
• Because the timer operates synchronously with the count clock, a count clock-dependent delay is included
before F/F output is inverted after the timer is enabled.
Appendix 4.8.9 Precautions on Using TMS Measure Input
The following describes precautions to be observed when using TMS measure input.
• If measure event input and write to the counter occur in the same clock period, the write value is set in the
counter while at the same time latched into the measure register.
Appendix 4.8 Precautions about the Multijunction Timers
Appendix 4-10
SUMMARY OF PRECAUTIONS
32180 Group User's Manual (Rev. 1.0)