HD404889_03 Datasheet, PDF (86/197 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Timer B
Timer B Functions: Timer B has the following functions.
• Free-running/reload timer
• External event counter
• Timer output operation (toggle output, PWM output)
The block diagram of timer B is shown in figure 37.
Timer C clock source
TOB
EVNB
Timer output
control logic
1
Edge detection
logic
2
System ^φPER
clock
÷2
÷4
÷8
÷32
÷128
÷512
÷2048
3
Timer mode
register B1
(TMB1)
3
Timer B ineterrupt
request flag
(IFTB)
Timer read
register BL
(TRBL)
4
Timer read
register BU
(TRBU)
Timer counter B
(TCBL)
(TCBU)
4
4
Timer write register B
(TWBL)
(TWBU)
Data bus
Clock line
Signal line
Timer mode
register B2
(TMB2)
Figure 37 Timer B Block Diagram
Rev.6.00, Sep.08.2003, page 86 of 197