sh66p51 SinoWealth Micro-Electronics Corp. Ltd, sh66p51 Datasheet - Page 30

• Manufacturer Part Number: sh66p51
• Description: Otp 2k 4-bit Micro-controller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

11. HALT and STOP Mode
After the execution of HALT instruction, SH66P51 will enter the HALT mode. In the HALT mode, CPU will STOP operating.
But peripheral circuit (Timer0, Base timer) will keep status.
After the execution of STOP instruction, SH66P51 will enter the STOP mode. The whole chip (including oscillator) will
STOP operating.
In the HALT mode, SH66P51 can be waked up if any interrupt occurs.
In the STOP mode, SH66P51 can be waked up if port interrupt occurs.
When CPU is awaked from the HALT/STOP by any interrupt source, it will execute the relevant interrupt serve subroutine at
first. Then the instruction next to halt /stop is executed.
12. Low Power Detect (LPD)
The LPD function monitors the supply voltage of the battery
Functions of LPD Circuit:
The LPD circuit has the following functions:
LPD bit = 1 when V
LPD bit = 0 when V
13. Low Voltage Reset (LVR)
The LVR function is to monitor the supply voltage and generate an internal reset in the device. It is typically used in AC line
applications or large battery where large loads may be switched in and cause the device voltage to temporarily fall below
the specified operating minimum.
The LVR circuit has the following functions:
- Generates a system reset when V
- Cancels the system reset when V
Address
$06
Bit3
-
DD
DD
≤ V
> V
LPD
LPD
Bit2
-
(= 2.3 ± 0.1V)
(= 2.3 ± 0.1V)
DD
DD
> V
≤ V
Bit1
LVR
-
LVR
(= 1.7 ± 0.1V).
(= 1.7 ± 0.1V).
Bit0
LPD
30
R/W
R
Bit0: 2.3V LPD flag
Remarks
SH66P51