HD404669 Datasheet, PDF (68/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

HD404669 Series
EVND
Edge detection logic
Timer D interrupt
request flag
(IFTD)
System
clock
øPER
÷2
÷4
÷8
÷ 32
÷ 128
÷ 512
÷ 2048
Timer read
register DL
(TRDL)
Timer read
register DU
(TRDU)
4
clock
Timer counter D
(TCDL)
(TCDU)
4
4
Timer write register D
(TWDL)
(TWDU)
3
Timer mode
register D1
(TMD1)
2
Edge detection
select register 2
Edge detection control
(ESR2)
TOD
Data bus
Clock line
Signal line
Timer output
control logic
Timer mode
register D2
(TMD2)
Figure 49(1) Block Diagram of Timer D (Free-Running/Reload Timer/Event Counter Modes)
68