BS87B12A-3 Datasheet, PDF (79/224 Pages) Holtek Semiconductor Inc – Touch A/D Flash MCU with OCVP

BS87B12A-3/BS87C16A-3/BS87D20A-3
Touch A/D Flash MCU with OCVP
I/O Port Source Current Selection
These devices support different output source current driving capability for each I/O port. With the
selection register, SLEDCn, specific I/O port can support four levels of the source current driving
capability. Users should refer to the I/O Port characteristics section to select the desired output
source current for different applications.
Register
Name
SLEDC0
SLEDC1
7
PBPS3
—
6
PBPS2
—
5
PBPS1
—
Bit
4
3
PBPS0 PAPS3
—
PCPS3
2
PAPS2
PCPS2
1
PAPS1
PCPS1
0
PAPS0
PCPS0
I/O Port Source Current Selection Registers List – BS87B12A-3
Register
Name
SLEDC0
SLEDC1
7
PBPS3
PDPS3
6
PBPS2
PDPS2
5
PBPS1
PDPS1
Bit
4
3
PBPS0 PAPS3
PDPS0 PCPS3
2
PAPS2
PCPS2
1
PAPS1
PCPS1
0
PAPS0
PCPS0
I/O Port Source Current Selection Registers List – BS87C16A-3
Register
Name
SLEDC0
SLEDC1
SLEDC2
7
PBPS3
PDPS3
—
6
PBPS2
PDPS2
—
5
PBPS1
PDPS1
PFPS1
Bit
4
3
PBPS0 PAPS3
PDPS0 PCPS3
PFPS0 PEPS3
2
PAPS2
PCPS2
PEPS2
1
PAPS1
PCPS1
PEPS1
0
PAPS0
PCPS0
PEPS0
I/O Port Source Current Selection Registers List – BS87D20A-3
SLEDC0 Register
Bit
Name
R/W
POR
7
PBPS3
R/W
0
6
PBPS2
R/W
0
5
PBPS1
R/W
0
4
PBPS0
R/W
0
3
PAPS3
R/W
0
2
PAPS2
R/W
0
Bit 7~6
Bit 5~4
Bit 3~2
Bit 1~0
PBPS3~PBPS2: PB7~PB4 source current selection
00: source current=Level 0 (min.)
01: source current=Level 1
10: source current=Level 2
11: source current=Level 3 (max.)
PBPS1~PBPS0: PB3~PB0 source current selection
00: source current=Level 0 (min.)
01: source current=Level 1
10: source current=Level 2
11: source current=Level 3 (max.)
PAPS3~PAPS2: PA7 and PA4 source current selection
00: source current=Level 0 (min.)
01: source current=Level 1
10: source current=Level 2
11: source current=Level 3 (max.)
PAPS1~PAPS0: PA3~PA0 source current selection
00: source current=Level 0 (min.)
01: source current=Level 1
10: source current=Level 2
11: source current=Level 3 (max.)
1
PAPS1
R/W
0
0
PAPS0
R/W
0
Rev. 1.20
79
December 05, 2016