HD404356 Datasheet, PDF (46/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404358 Series
Timer B
Timer B Functions: Timer B has the following functions.
• Free-running/reload timer
• External event counter
• Input capture timer
The block diagram for each operation mode of timer B is shown in figures 31 and 32.
Interrupt request
flag of timer B
(IFTB)
EVNB
Edge
detector
System
clock
ø_PER
2
Timer read
register B upper
(TRBU)
Timer read
register B lower
(TRBL)
Clock
Free-running
timer control
signal
Timer counter B
(TCB)
Timer write
register B upper
(TWBU)
Overflow
Selector
Timer write
register B lower
(TWBL)
3
Prescaler S (PSS)
Edge detection control signal
Timer mode
register B1
(TMB1)
Timer mode
register B2
(TMB2)
Figure 31 Timer B Free-Running and Reload Operation Block Diagram
46