参数资料
型号: M38867E8AFS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, UVPROM, 5 MHz, MICROCONTROLLER, CQCC80
封装: 0.80 MM PITCH, CERAMIC, LCC-80
文件页数: 43/113页
文件大小: 1871K
代理商: M38867E8AFS
32
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PULSE WIDTH MODULATION (PWM)
OUTPUT CIRCUIT
The 3886 group has two PWM output circuits, PWM0 and PWM1,
with 14-bit resolution respectively. These can operate indepen-
dently. When the oscillation frequency XIN is 10 MHz, the
minimum resolution bit width is 200 ns and the cycle period is
3276.8
s. The PWM timing generator supplies a PWM control
signal based on a signal that is the frequency of the XIN clock.
Fig. 29 PWM block diagram (PWM0)
The following explanation assumes f(XIN) = 8 MHz.
14
1/2
PWM0 enable bit
P30 latch
P30/PWM00
PWM0L register (address 003116)
PWM0H register
(address 003016)
bit 7
bit 0
bit 5
MSB
LSB
PWM0
bit 7
bit 0
PWM0
timing
generator
(64
s period)
(4096
s period)
PWM0 latch (14 bits)
Set to “1”
at write
Data Bus
f(XIN)
(8MHz)
14-bit PWM0 circuit
P56 direction register
PWM0 enable bit
P56 latch
P56/DA1/PWM01
PWM0 output selection bit
P30 direction register
(4MHz)
PWM0 enable bit
PWM0 output selection bit
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