Programmable One-Shot Generation Mode - Renesas M16C FAMILY Hardware Manual

Under development
Preliminary specification
Specifications in this manual are tentative and subject to change.
R8C/11 Group

12.3.3 Programmable One-shot Generation Mode

In this mode, upon program command or external trigger input (input to the INT0 pin), the microcom-
puter outputs the one-shot pulse from the TZ
Generation Mode Specifications"). When a trigger occurs, the timer starts operating from the point
only once for a given period equal to the set value in the TZPR register. The TZSC is unused in this
mode. Figure 12.24 shows the TYZMR register and PUM register in this mode. Figure 12.25 shows
an operation example in this mode.
Table 12.11 Programmable One-shot Generation Mode Specifications
Item
Count source
Count operation
Divide ratio
Count start condition
Count stop condition
Interrupt request generation timing In half cycles of count source, after the timer underflows (at the same time as the TZout
TZ pin function
OUT
_______
INT0 pin function
Read from timer
Write to timer
Select function
Notes:
1. The TZS bit in the TYZMR register must be set to "1" (start counting).
2. The TZS bit must be set to "1" (start counting), the INT0EN bit in the INTEN register to "1" (enabling INT0 input), and
the INOSTG bit in the PUM register to "1" (enabling INT0 one-shot trigger).
Rev.0.91 2003 Sep 08
f , f , f , Timer Y underflow
1 2 8
• Downcounts set value in TZPR register
• When the timer underflows, it reloads the contents of reload register before stopping
counting.
• When a counting stops, the timer reloads the contents of the reload register before it
stops.
fi/(n+1)(m+1)
n: set value in PREZ register, m: set value in TZPR register
• Set TZOS bit in TYZOC register to "1" (start one-shot)
• Input active trigger to INT0 pin
• When reloading is completed after count value was set to "00
• When TZS bit in TYZMR register is set to "0" (stop counting)
• When TZOS bit in TYZOC register is set to "0" (stop one-shot)
output ends) [Timer Z interrupt].
Pulse output
Programmable I/O port, external interrupt input pin, or external trigger input pin
Count value can be read out by reading TZPR register.
Same applies to PREZ register.
Value written to TZPR register is written to reload register only
Same applies to PREZ register.
• Output level latch select function
Output level for one-shot pulse waveform is selected by TZOPL bit.
• INT0 pin one-shot trigger control function and polarity select function
Trigger input from INT0 pin can be set to active or inactive by INOSTG bit. Also, an
active trigger's polarity can be selected by INOSEG bit.
page 95 of 184
pin (see "Table 12.11 Programmable One-shot
OUT
Specification
2
_____
12.3 Timer (Timer Z)
1
"
16
3
.
_______