HT48RA0-2/HT48CA0-2
Pin Assignment
P
P
P
P
A
A
B
B
1
0
1
0
2
1
1
1
1
1
1
1
1
1
0
9
8
7
6
5
4
3
2
1
P
P
P
P
P
P
P
P
P
P
A
A
A
A
A
A
B
B
B
B
2
3
4
5
6
7
2
3
4
5
1
2
3
4
5
6
7
8
9
1
P
C
0
/
R
E
M
V
D
D
O
O
S
S
C
C
2
1
V
S
E
S
S
R
0
H
T
4
8
R
A
0
-
2
/
H
T
4
8
C
A
0
-
2
2
0
S
O
P
-
A
/
S
S
O
P
-
A
Pin Description
Code
Pin Name
I/O
Description
Option
Bidirectional 8-bit input/output port with pull-high resistors. Each bit can be de-
termined as NMOS output or Schmitt trigger input by software instructions.
PA0~PA7
I/O
¾
2-bit bidirectional input/output lines with pull-high resistors. Each bit can be de-
termined as NMOS output or Schmitt trigger input by software instructions.
Each bit can also be configured as wake-up input by code option.
Wake-up
or None
PB0, PB1
I/O
Wake-up or 4-bit Schmitt trigger input lines with pull-high resistors. Each bit can be config-
PB2~PB5
PC0/REM
I
None
ured as a wake-up input by code option.
Level or
Carrier
Level or carrier output pin
O
PC0 can be set as CMOS output pin or carrier output pin by code option.
VDD
VSS
Positive power supply
¾
¾
¾
¾
Negative power supply, ground
OSC1, OSC2 are connected to an RC network or a crystal (determined by
code option) for the internal system clock. In the case of RC operation, OSC2
is the output terminal for 1/4 system clock (NMOS open drain output).
OSC2
OSC1
O
I
Crystal
or RC
RES
I
Schmitt trigger reset input. Active low.
¾
Absolute Maximum Ratings
Supply Voltage...........................VSS-0.3V to VSS+4.0V
Input Voltage..............................VSS-0.3V to VDD+0.3V
Storage Temperature............................-50°C to 125°C
Operating Temperature...........................-40°C to 85°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Rev. 1.50
2
July 23, 2004
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
