HD404889_03 Datasheet, PDF (102/197 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Timer D (HD404889/HD404899/HD404878 Series)
Timer D functions : Timer D has the following functions.
• Free-running/reload timer
• External event counter
• Input capture timer
Block diagrams of timer D in different operating modes are shown in figures 55-1 and 55-2.
EVND
Edge detection
logic
System
clock
φPER
÷2
÷4
÷8
÷ 32
÷ 128
÷ 512
÷ 2048
3
Timer mode
register D1
(TMD1)
2
Timer D interrupt
request flag
(IFTD)
Timer read
register DL
(TRDL)
Timer read register
DU (TRDU)
4
Timer counter D
(TCDL)
(TCDU)
4
4
Timer write register D
(TWDL)
(TWDU)
Edge detection
control
Data bus
Clock line
Signal line
Timer mode
register D2
(TMD2)
Figure 55-1 Timer D Block Diagram (Reload Timer and Event Counter Modes)
Rev.6.00, Sep.08.2003, page 102 of 197