upd17225 Renesas Electronics Corporation., upd17225 Datasheet - Page 48

• Manufacturer Part Number: upd17225
• Description: 4-bit Single-chip Microcontroller For Small General-purpose Infrared Remote Control Transmitter
• Manufacturer: Renesas Electronics Corporation.

8.3
consumption.
Oscillation is not resumed, until the STOP mode is released. After the STOP mode has been released, the HALT mode
is set. Set the time required to release the HALT mode by using the timer with modulo function.
is set, is shown in the following table.
48
Remark Set the 8-bit modulo timer before executing STOP instruction.
Caution Do not execute an instruction that clears the interrupt request flag (IRQ
In the STOP mode, the system clock (f
To set the STOP mode, use the STOP instruction.
The STOP mode releasing condition can be specified by the STOP instruction operand, as shown in Table 8-4.
After the STOP mode has released, the operation is performed as follows:
The PD17225 oscillator is stopped, when the STOP instruction has been executed (i.e., in the STOP mode).
The time that elapses, after the STOP mode has been released by occurrence of an interrupt, until an operation mode
STOP Mode
<1> Resets IRQTM.
<2> Starts the basic interval timer and watchdog timer (does not reset).
<3> Resets and starts the 8-bit timer.
<4> Executes the instruction next to [STOP 8H] when the current value of the 8-bit counter coincides with
the value of the modulo register (IRQTM is set).
interrupt enable flag (IP
STOP mode may not be set.
Other Than Above
8-Bit Modulo Register Set Value
Operand Value
1000B (08H)
Table 8-4. STOP Mode Releasing Conditions
(TMM)
FFH
40H
X
) oscillation is stopped and the program execution is stopped to minimize current
) is set immediately before the STOP 8H instruction; otherwise, the
When any of P0A
Setting prohibited
Data Sheet U12643EJ2V0DS00
Time Required to Set Operation Mode
Releasing Conditions
0
-P0A
after STOP Mode Release
3
16.384 ms (64 s
4.160 ms (64 s
and P0B
At 4 MHz
PD17225, 17226, 17227, 17228
0
-P0B
3
pins goes low
65)
256)
) for which the