HD6433802H Datasheet, PDF (217/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

2. Block diagram
Figure 9.7 shows a block diagram of the asynchronous event counter.
ø
PSS
ECCR
IRREC
ECCSR
ø/2
ø/4, ø/8
AEVH
Edge sensing
circuit
AEVL
IRQAEC
Edge sensing
circuit
Edge sensing
circuit
OVH
OVL
ECH
(8 bit) _CK
ECL
(8 bit) _CK
ECPWCRH
To CPU interrupt
(IRREC2)
ECPWCRL
ø/2, ø/4,
ø/8, ø/16,
ø/32, ø/64
PWM waveform generator
ECPWDRH
ECPWDRL
AEGSR
Notation
ECPWCRH: Event counter PWM compare register H
ECPWDRH: Event counter PWM data register H
AEGSR: Input pin edge selection register
ECCSR: Event counter control/status register
ECH:
Event counter H
ECL:
Event counter L
ECPWCRL: Event counter PWM compare register L
ECPWDRL: Event counter PWM data register L
ECCR:
Event counter control register
Figure 9.7 Block Diagram of Asynchronous Event Counter
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