BS85B12-3 HOLTEK [Holtek Semiconductor Inc], BS85B12-3 Datasheet - Page 56
![no-image](/images/no-image-200.jpg)
BS85B12-3
Manufacturer Part Number
BS85B12-3
Description
Touch Key Flash Type 8-Bit MCU with LCD/LED Driver
Manufacturer
HOLTEK [Holtek Semiconductor Inc]
Datasheet
1.BS85B12-3.pdf
(182 pages)
- Current page: 56 of 182
- Download datasheet (3Mb)
Rev. 1.00
Register
Bit 7~0
Bit 7~4
Bit 3~0
PAWU
Name
PAPU
PBPU
PCPU
PDPU
PEPU
Name
Name
PAC
PBC
PCC
PDC
PEC
POR
POR
R/W
R/W
Pull-high Resistors
PC
PD
PA
PB
PE
Bit
Bit
BS85C20-3
BS85B12-3: PAPU, PCPU Registers
BS85C20-3: PAPU, PBPU, PCPU, PDPU Registers
BS85B12-3: PBPU Registers
BS85C20-3: PEPU Registers
Many product applications require pull-high resistors for their switch inputs usually requiring the use
of an external resistor. To eliminate the need for these external resistors, all I/O pins, when configured
as an input have the capability of being connected to an internal pull-high resistor. These pull-high
resistors are selected using the register PAPU~PEPU, and are implemented using weak PMOS
transistors.
R/W
D7
D7
D7
D7
D7
D7
D7
D7
D7
D7
D7
D7
D7
D7
PxPU Port bit 7~bit 0 Pull-High control
unimplemented, read as 0
PxPU: Port bit 5~bit 0 Pull-High control
7
7
0
7
0: disable
1: enable
0: disable
1: enable
Touch Key Flash MCU with LCD/LED Driver
R/W
D6
D6
D6
D6
D6
D6
D6
D6
D6
D6
D6
D6
D6
D6
6
6
0
6
R/W
R/W
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
D5
5
5
0
5
0
R/W
R/W
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
D4
50
4
4
0
4
0
Bit
R/W
R/W
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
D3
3
3
0
3
0
BS85B12-3/BS85C20-3
R/W
R/W
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
D2
2
2
0
2
0
R/W
R/W
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
D1
1
1
0
1
0
February 1, 2011
R/W
R/W
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
D0
0
0
0
0
0
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