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CHAPTER 11 12-bit PWM
11.1 Overview of 12-bit PWM
The 12-bit PWM has a 12-bit resolution using the duty control and added pulse based
on the selectable basic frequency.
■ Feature of 12-bit PWM
• 12-bit resolution (rate, multi-type)
• The conversion cycle can be selected: 0.2 ms/basic frequency 78.1 kHz (in fch:@20 MHz) and 0.4 ms/
basic frequency 39.0 kHz (in fch:@20 MHz).
■ Block Diagram of 12-bit PWM
Figure 11.1-1 Block Diagram of 12-bit PWM
8bit Counter
4bit Counter
8bit Comp
8bit Latch
Data Reg Low
4bit Comp
4bit Latch
Data Reg Hi
PWMx0
Output
PWMx1
Output
PWMx2
Output
Test STR CKS LFLG LREQ PWMxC
Internal Bus
2/fch
1/fch
M
P
X
M
P
X
R
S
Q
DQ
Q
S
R
OVF
EQ
Load
PWMx0L
PWMx0H