sh66k12 SinoWealth Micro-Electronics Corp. Ltd, sh66k12 Datasheet - Page 7

• Manufacturer Part Number: sh66k12
• Description: Mask 4-bit Microcontroller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

The programming alarm waveform is shown below:
System Register $15:
4. LCD Driver
The LCD driver contains a controller, voltage generator, 4 common signal pins, and 26 segment driver pins. There are two
different driving modes that are programmable, one is 1/4 duty and 1/3 bias, and the other is 1/3 duty and 1/2 bias. Driving
mode is controlled by register $15H and the power-on status is 1/3 duty, 1/2 bias. The controller consists of display data RAM
and a duty generator. The LCD data RAM is a dual port RAM that transfers data to segment pins automatically without a
program control.
LCD segment 1 - 4 can also be used as output ports, it is selected by the bit3 of system register $13H. When segments 1 - 4 are
output ports, data can be written to bit 0 of the same address (300H - 303H). LCD RAM can be used as data memory if needed.
When the "STOP" instruction is executed, the LCD will be turned off, but the data of LCD RAM is the same before executing the
"STOP" instruction.
Configuration of LCD RAM area:
(a) When segments 1 - 4 are used as output ports:
Address
$15
Address
300H
301H
302H
303H
Bit 3
-
-
-
Bit 2
BD OUTPUT 2K or 4K
-
-
-
COM4
Bit 3
Bit 1
AEC = $C
AEC = $A
AEC = $8
AEC = $F
AEC = $0
-
-
-
-
PAM = 1
-
-
-
PAM = 1
PAM = 1
PAM = 1
PAM = 1
16Hz
8Hz
4Hz
2Hz
1Hz
DUTY
Bit 0
1
0
R/W
R/W
COM3
Bit 2
-
-
-
-
7
Bit0: LCD duty control.
LCD driver = 1/4 duty, 1/3 bias
LCD driver = 1/3 duty, 1/2 bias
Description
COM2
Bit 1
-
-
-
-
DATA_BIT
DATA_BIT
DATA_BIT
DATA_BIT
SH66K12
COM1
Power on
Bit 0
Yes