Rev. 2.0, 11/00, page 414 of 1037
20.1.2
Block Diagram
Figure 20.1 shows a block diagram of the 12-bit PWM (1 channel). The PWM signal is
generated by combining quantizing pulses from a 12-bit pulse generator with quantizing pulses
derived from the contents of a data register. Low-frequency components are reduced because
the two quantizing pulses have different frequencies. The error data is represented by an
unsigned 12-bit binary number.
Internal data bus
[Legend]
CAPPWM
or
DRMPWM
CAPPWM
/2
/4
/8
/16
/32
/64
/128
DRMPWM
: Capstan mix pin
: Drum mix pin
PWM control register
Digital filter
circuit
Error data
PTON
PWM data register
Output control circuit
Pulse generator
Counter
· DFUCR
CP/DP
Figure 20.1 Block Diagram of 12-Bit PWM (1 channel)
Summary of Contents for Hitachi H8S/2191
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