BS85B12-3 HOLTEK [Holtek Semiconductor Inc], BS85B12-3 Datasheet - Page 150

• Manufacturer Part Number: BS85B12-3
• Description: Touch Key Flash Type 8-Bit MCU with LCD/LED Driver
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Rev. 1.00
Bit 7
Bit 6~5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Name
POR
R/W
LCD Bias Control
LCD Driver Registers
Bit
SLCDC0 Register
FRAME
The COM0~COMn waveform is controlled by the application program using the FRAME bit, and the
corresponding I/O data register for the respective COM pin to determine whether the COM0~COMn
output has a value of either VDD, VSS or Vbias. The SEG0~SEGm waveform is controlled in a
similar way using the FRAME bit and the corresponding I/O data register for the respective SEG pin to
determine whether the SEG0~SEGn output has a value of either VDD, VSS or Vbias.
The LCD COM and SEG driver enable a range of selections to be provided to suit the requirement of
the LCD panel which are being used. The bias resistor choice is implemented using the ISEL1 and
ISEL0 bits in the LCD control register.
R/W
FRAME: Present Frame output select -- Frame 0 or Frame 1
ISEL1, ISEL0: SCOM and SSEG operating current selection -- V
SLCDEN: SCOM and SSEG module on/off control
The SCOMn and SSEGm lines can be enabled using COMnEN and SEGmEN if SLCDEN=1.
When SLCDEN=0, then the SCOMn and SSEGm outputs will be fixed at a VDD level.
COM3EN: SCOM3 or other function selection
COM2EN: SCOM2 or other function selection
COM1EN: SCOM1 or other function selection
COM0EN: SCOM0 or other function selection
7
0
0: Frame 0
1: Frame 1
0: 25 A
1: 50 A
2: 100 A
3: 200 A
0: disable
1: enable
0: Other function
1: SCOM3
0: Other function
1: SCOM2
0: Other function
1: SCOM1
0: Other function
1: SCOM0
Touch Key Flash MCU with LCD/LED Driver
ISEL1
R/W
6
0
ISEL0
R/W
5
0
SLCDEN
R/W
144
4
0
COM3EN
R/W
3
0
BS85B12-3/BS85C20-3
COM2EN
R/W
2
0
DD
=5V
COM1EN
R/W
1
0
February 1, 2011
COM0EN
R/W
0
0