HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 226

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

After the count value in TCB1 reaches H'FF, the next clock signal input causes timer B1 to
overflow. The TLB1 value is then loaded into TCB1, and the count continues from that value. The
overflow period can be set within a range from 1 to 256 input clocks, depending on the TLB1
value.
The clock sources and interrupts in auto-reload mode are the same as in interval mode.
In auto-reload mode (TMB17 = 1), when a new value is set in TLB1, the TLB1 value is also set in
TCB1.
Event Counter Operation: Timer B1 can operate as an event counter, counting rising or falling
edges of an external event signal input at pin TMIB. External event counting is selected by setting
bits TMB12 to TMB10 in timer mode register B1 (TMB1) to all 1s (111).
When timer B1 is used to count external event input, bit INTEN6 in IENR3 should be cleared to 0
to disable INT
9.3.4
Table 9.7 summarizes the timer B1 operation states.
Table 9.7
Operation Mode
TCB1 Interval
TMB1
218
Auto reload
Timer B1 Operation States
Timer B1 Operation States
6
interrupt requests.
Reset
Reset
Reset
Reset
Active
Functions
Functions
Functions
Sleep
Functions
Functions
Retained
Watch
Halted
Halted
Retained
Sub-
active
Halted
Halted
Retained Retained Retained
Sub-
sleep
Halted
Halted
Standby
Halted
Halted