BS83B08A-3 Datasheet, PDF (57/119 Pages) Holtek Semiconductor Inc – 8-Bit Touch Key Flash MCU

BS83B08A-3/BS83B12A-3/BS83B16A-3
BS83B08A-4/BS83B12A-4/BS83B16A-4
8-Bit Touch Key Flash MCU
BS83B16A-3/BS83B16A-4
Register
Bit
Name
7
6
5
4
3
2
1
0
PAWU
D7
—
—
D4
D3
D2
D1
D0
PAPU
D7
—
—
D4
D3
D2
D1
D0
PA
D7
—
—
D4
D3
D2
D1
D0
PAC
D7
—
—
D4
D3
D2
D1
D0
PBPU
D7
D6
D5
D4
D3
D2
D1
D0
PB
D7
D6
D5
D4
D3
D2
D1
D0
PBC
D7
D6
D5
D4
D3
D2
D1
D0
PCPU
D7
D6
D5
D4
D3
D2
D1
D0
PC
D7
D6
D5
D4
D3
D2
D1
D0
PCC
D7
D6
D5
D4
D3
D2
D1
D0
Pull-high Resistors
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 registers PAPU~PCPU, and are implemented using weak
PMOS transistors.
PAPU Register
Bit
7
6
Name
D7
—
R/W
R/W
—
POR
0
—
5
4
3
2
1
0
—
D4
D3
D2
D1
D0
—
R/W
R/W
R/W
R/W
R/W
—
0
0
0
0
0
Bit 7
Bit 6~5
Bit 4~0
I/O Port A bit 7 Pull-High Control
0: Disable
1: Enable
Unimplemented, read as “0”
I/O Port A bit 4~bit 0 Pull-High Control
0: Disable
1: Enable
PBPU Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~0
I/O Port B bit 7~bit 0 Pull-High Control
0: Disable
1: Enable
Rev. 1.00
57
May 02, 2013