sh6631a SinoWealth Micro-Electronics Corp. Ltd, sh6631a Datasheet - Page 19

• Manufacturer Part Number: sh6631a
• Description: Mask 4-bit Microcontroller
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

Application Circuit (for reference only)
AP1:
Remote Control (48 Keys)
(1) Oscillator: Ceramic 400KHz ~ 4MHz
(2) Port A, D: I/O Buffers
(3) Port B and C: Input Buffers
(4) Option RESET pin with pull-up; and C1 can be removed. For high reliability, C1 is better to be added.
(5) R1 = 0 is possible, but the REM specification is revised to reduce power consumption
(6) I
AP2:
Remote Control (40 Keys)
The simplified code option would not sink any power consumption since PORTD.1 short with other I/O ports. Because
PORTD.1 can be programmed as input only with pull-up, so that PORTB or PORTC can be scanned out to detect PORTD.1
option. After detection, PORTD.1 pull-up resistor can be turn off by software, if there is a option selected. If there is no option
selected, then the pull-up resistor cannot be turned off, so that PORTD.1 would not be floating.
REM
= -5mA (V
REM
47µ
= 1V).
47µ
4MHz
20p
20p
R1
20p
20p
R1
GND
V
REM
RESET
OSCO
OSCI
DD
GND
V
REM
RESET
OSCO
OSCI
DD
PORTD.1
PORTD.0
PORTC.3
PORTC.2
PORTC.1
PORTC.0
PORTB.3
PORTB.2
PORTB.1
PORTB.0
PORTA.3
PORTA.2
PORTA.1
PORTA.0
19
PORTD.1
PORTD.0
PORTC.3
PORTC.2
PORTC.1
PORTC.0
PORTB.3
PORTB.2
PORTB.1
PORTB.0
PORTA.3
PORTA.2
PORTA.1
PORTA.0
Simplified Custom Code
switch can be closed
Selection only one
SH6631A