UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 411

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

13.3.4 PWM Pulse Width Rewrite Cycle Specification
cycles (2
by means of the SYNn bits of the PWM control register (PWMC).
takes a maximum of 2
in the PWM modulo register (PWMn: n = 0, 1) is output. An example of the PWM output timing at this time is shown in
Figure 13-6.
In this case, it takes a maximum of 2
the data written in the PWMn in is output.
(1)), the obtained PWM pulse precision is between 8 bits and 12 bits, and is lower than when the PWM pulse rewrite cycle
is specified as 2
The start of PWM output and pulse width changes are performed in synchronization either with every 16 PWM pulse
When the SYNn bit is cleared (0), a pulse width change is performed every 16 PWM pulse cycles (2
When the SYNn bit is set (1), on the other hand, a pulse width change is performed every PWM pulse cycle (2
However, caution is required since, if the PWM pulse rewrite cycle is specified as every 2
An example of the PWM output timing when the rewrite timing is 2
Cautions 1. Pulse width rewriting is performed every PWM pulse cycle.
PWM
Output Pin
PWMn
Contents
12
/f
PWM Pulse Width
Switching Timing
Figure 13-6 PWM Output Timing Example 1 (PWM Pulse Width Rewrite Cycle = 2
PWMC
2. The PWM pulse precision is 12 bits.
12
) or with every PWM pulse cycle (2
/f
PWMC
12
clocks (328 s when f
.
PWM
Output
Enabled
Pulse Cycles
16 PWM
8
clocks (20.5 s when f
n
CHAPTER 13 PWM OUTPUT UNIT
PWMC
8
/f
PWM Pulse Width
Switching Timing
= 12.5 MHz) until a pulse of a width corresponding to the data written
PWMC
). This PWM pulse width rewrite cycle specification is performed
PWMC
= 12.5 MHz) until a pulse of a width corresponding to
8
PWMn
Rewrite
/f
PWMC
Pulse Cycles
16 PWM
is shown in Figure 13-7.
m
PWM Pulse Width
Switching Timing
8
/f
PWMC
, (if the SYNn bit is set
12
12
/f
/f
PWMC
PWMC
). It therefore
)
8
/f
PWMC
371
).