Holtek HT66F488 Manual page 57

HT66F488/HT66F489
A/D Flash MCU with EEPROM
I/O Port source current selection
The PA~PD input/output ports have programmable source current functions. Four levels of source
current can be selected by the registers.
IOHR0 Register
Bit
�a�e IOHS31
R/W R/W
POR
Bit 7~6 IOHS31~IOHS30: PA3 source current output selection bit
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
Bit 5~4 IOHS21~IOHS20: PA2 source current output selection bit
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
Bit 3~2 IOHS11~IOHS10: PA1 source current output selection bit
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
IOHS01~IOHS00: PA0 source current output selection bit
Bit 1~0
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
IOHR1 Register
Bit
�a�e IOHS�1
R/W R/W
POR
Bit 7~6 IOHS71~IOHS70: PA7 source current output selection bit
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
Bit 5~4 IOHS61~IOHS60: PA6 source current output selection bit
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
IOHS51~IOHS50: PA5 source current output selection bit
Bit 3~2
00: Full source current output
01: 10/22 full source current output
10: 7/22 full source current output
11: 4/22 full source current output
Rev. 1.21
7 6 5
IOHS3� IOHS21 IOHS2�
R/W R/W
� � �
7 6 5
IOHS�� IOHS61 IOHS6�
R/W R/W
� � �
5�
4 3 2
IOHS11 IOHS1�
R/W R/W R/W
� � �
4 3 2
IOHS51 IOHS5�
R/W R/W R/W
� � �
1 0
IOHS�1 IOHS��
R/W R/W
� �
1 0
IOHS41 IOHS4�
R/W R/W
� �
�ove��e� ��� 2�1�