UPD65MC NEC, UPD65MC Datasheet - Page 20

• Manufacturer Part Number: UPD65MC
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

4.2 Timer Operation
instruction. The timer operation instructions for making the timer start operation are shown below:
0, the zero detecting circuit generates the timer operation end signal to stop the timer operation. At this time, if
the timer is in HALT mode (HALT # 101B) waiting for the timer to stop its operation, the HALT mode is released
and the instruction following the HALT instruction is executed. The output of the timer operation end signal is
continued while the down counter is 0 and the timer is stopped. There is the following relational expression between
the timer’s time and the down counter’s set value.
S
20
1
/LED pin and the REM pin. The REM pin can also output the carrier while the timer is in operation.
The timer starts (counting down) when a value other than 0 is set for the down counter with a timer operation
The down counter is decremented (–1) in the cycle of 64/f
Note This becomes 128/f
By setting 1 for the flag (t
Note The carrier output results if bit 2 of the control register 0 is cleared (to 0).
MOV T0, A
MOV T1, A
MOV T, #data10
MOV T, @R0
Timer time = (Set value + 1)
Timer operating
Timer halting
REM
LED
Figure 4-2. Timer Output (when carrier is not output)
9
X
) which enables the timer output, the timer can output its operation status from the
if bit 3 of the control register is set (to 1).
Table 4-1. Timer Output (at t
64/f
Timer value: (set value + 1)
X
Data Sheet U14380EJ2V0DS00
(or 128/f
S
1
/LED Pin
H
L
X Note
X
)
or 128/f
X
64/f
Note
9
H (or carrier output
= 1)
X
. If the value of the down counter becomes
(or 128/f
REM Pin
X
L
)
Note
)
PD64A, 65