Programmable Waveform Generation Mode - Renesas M16C FAMILY Hardware Manual

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

12.3.2 Programmable Waveform Generation Mode

In this mode, an signal output from the TZ
the values in the TZPR register and TZSC register are counted alternately (see "Table 12.10 Pro-
grammable Waveform Generation Mode Specifications"). A counting starts by counting the value
set in the TZPR register. Figure 12.23 shows TYZMR and PUM registers in this mode. The Timer Z
operates in the same way as the Timer Y in this mode. See Figure 12.17 (Timer Y operation ex
ample in programmable waveform generation mode ).
Table 12.10 Programmable Waveform Generation Mode Specifications
Item
Count source
Count operation
Period
Count start condition
Count stop condition
Interrupt request generation timing In half of count source, after Timer Z underflows during secondary period (at the same
TZ pin function
OUT
_____
INT0 pin functions
Read from timer
Write to timer
Select function
Notes:
1. When the counting stopped, the output level is that in the secondary period.
2. Even when counting the secondary period, read out the TZPR register.
3. The set value in the TZPR register and TZSC register are made effective by writing a value to the TZPR register. The
set values are reflected to the waveform output beginning with the next primary period after writing to the Timer Z
primary register.
4. The output is switched in sync with timer Z underflow in the secondary period.
Rev.0.91 2003 Sep 08
f , f , f , Timer Y underflow
1 2 8
• Down-count
• When the timer underflows, it reloads the contents of primary reload register and sec-
ondary reload register alternately before continuing counting.
fi/(n+1)((m+1)+(p+1))
n: set value in PREZ register, m: set value in TZPR register, p: set value in TZSC register
Write "1" (count start) to the TZS bit in the TYZMR register
Write "0" (count stop) to the TZS bit in the TYZMR register
time as the TZout output change) [Timer Z interrupt].
1
Pulse output
Programmable I/O port, or external interrupt 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 TZSC register and PREZ register
• Output level latch select function
The output level during primary and secondary periods is selected by the TZOPL bit.
• Programmable waveform generation output switching function
When the TZOCNT bit in the TYZOC register is set to "0", the output from TZ
inverted synchronously when the Timer Z underflows during the secondary period. And
when set to "1", a value in the P3_1 bit is output from TZ
Timer Z underflows during the secondary period
page 93 of 184
pin is inverted each time the counter underflows, while
OUT
Specification
2
.
4
12.3 Timer (Timer Z)
3
.
synchronously when the
OUT
.
is
OUT