HD404449 Datasheet, PDF (59/123 Pages) Hitachi Semiconductor – HD404449 SERIES

HD404449 Series
Timer B
Timer B Functions: Timer B has the following functions.
• Free-running/reload timer
• External event counter
• Timer output operation (toggle, 0, and 1 outputs)
The block diagram of timer B is shown in figure 42.
TOB
Timer B interrupt
request flag
(IFTB)
Timer output
control logic
Timer read register BU (TRBU)
Timer output control
Timer read
register BL
(TRBL)
Clock
Timer counter B
(TCB)
Overflow
EVNB
System
clock
ø_PER
Selector
Prescaler S (PSS)
Timer write
register BU
(TWBU)
Free-running/
Reload control
Timer write
register BL
(TWBL)
3
Timer mode
register B1
(TMB1)
2
Timer mode
register B2
(TMB2)
Figure 42 Timer B Block Diagram
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