參數(shù)資料
型號: TC9325F
廠商: Toshiba Corporation
英文描述: Single-Chip DTS Microcontroller (DTS-20)
中文描述: 單芯片微丘(丘- 20)
文件頁數(shù): 30/101頁
文件大?。?/td> 1802K
代理商: TC9325F
TC9325F
2002-05-14
30
. Reset Control Port
The CPU can be reset using the RESET pin or by a power-on reset.
If the power supply falls to 2.4 V or below, the STOP F/F bit is set to 1. This bit can be used for such
purposes as detecting a fall in the supply voltage from a momentary interruption or during Backup mode.
When such a drop in supply voltage is detected, set Clock Stop mode to prevent CPU malfunction then back
up the memory. Setting the 2-Hz reset bit to 1 resets the STOP F/F bit.
The reset control data are read to data memory by the IN1 instruction with the operand [CN
=
7H].
Note: For information on the 2-Hz F/F bit, see the timer port section.
2. Reset Circuit Structure and Operation Timing
Note: When the supply voltage falls to 2.4 V or below, set Backup mode.
Note: Reswitching on the power supply when the supply voltage falls to or below the range 0.3 to 0.6 V triggers
a reset.
Note: When Backup mode is not set, be sure to turn the power supply on from the GND level.
Note: If necessary, use the RESET pin to trigger a reset.
Y1
Y2
Y4
Y8
φ
L18P2
2 Hz
F/F
RESET
Y1
Y2
Y4
Y8
φ
K2F
2 Hz
F/F
0: Supply voltage above 2.4 V
1: Supply voltage 2.4 V or below
Y1
Y2
Y4
Y8
φ
K28
STOP
F/F
Supply voltage detection port
Setting the port to 1 resets the 2-Hz F/F and the STOP F/F.
40
GND
V
DD
Power-on
reset
circuit
S
F/F
R
2-Hz F/F reset signal
STOP F/F
Voltage detection signal for V
DD
=
2.4 V
CPU reset signal
Supply voltage
Execute 2-Hz F/F reset
STOP F/F bit
V
DD
2.4 V
GND
Example of Supply Voltage Detection Bit Operation
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