MULTIJUNCTION TIMERS
10.4 TIO (Input/Output-Related 16-Bit Timer)
10
10.4.12 Operation in TIO Single-shot Output Mode (without Correction Function)
(1) Outline of TIO single-shot output mode
In single-shot output mode, the timer generates a pulse in width of (reload 0 register set value + 1) only once
and then stops.
When the timer is enabled (by writing to the enable bit in software or by external input) after setting the reload
0 register, the counter is loaded with the content of the reload 0 register and starts counting synchronously
with the count clock. The counter counts down and when the minimum count is reached, stops upon under-
flow.
The F/F output waveform in single-shot output mode is inverted (F/F output level changes from low to high or
vice versa) at startup and upon underflow, generating a single-shot pulse waveform in width of (reload 0
register set value + 1) only once. An interrupt request can be generated when the counter underflows.
The count value is (reload 0 register set value + 1). (For counting operation, see also Section 10.3.9, “Opera-
tion of TOP Single-shot Output Mode.”)
(2) Precautions on using TIO single-shot output mode
The following describes precautions to be observed when using TIO 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.
• Because the timer operates synchronously with the count clock, a count clock-dependent delay is in-
cluded before F/F output is inverted after the timer is enabled.
32180 Group User’s Manual (Rev.1.0)
10-120
RENESAS [ RENESAS TECHNOLOGY CORP ]
