AT8xC5111
Pin Configuration
P4.4/MISO/AIN4
24
23
22
P4.4/MISO/AIN4
24
23
22
1
2
P4.3/INT1/AIN3
P4.2/SS/AIN2
P4.1/AIN1/T1
1
2
P4.3/INT1/AIN3
P4.2/SS/AIN2
P4.1/AIN1/T1
P4.5/MOSI/AIN5
P4.6/SPSCK/AIN6
P4.7/AIN7
P4.5/MOSI/AIN5
P4.6/SPSCK/AIN6
VREF
3
4
3
4
21 P4.0/AIN0
21 P4.0/AIN0
P3.0/RxD
20
P3.0/RxD
20
VREF
VSS
5
6
5
6
SO24
DIL24
SSOP24
P3.1/TxD
P3.1/TxD
19
19
VSS
AVSS
P1.2/ECI
18
P1.2/ECI
18
7
8
7
8
VCC
RST/VPP
XTAL2
AVCC
VCC
P1.3/CEX0
P1.3/CEX0
17
16
15
14
13
17
16
15
14
13
P1.4/CEX1
P1.4/CEX1
9
9
RST/VPP
XTAL1 10
P1.5/CEX2
P3.2/INT0
P3.3/T0
XTAL2 10
P1.5/CEX2
P3.2/INT0
P3.3/T0
P1.7/CEX4
XTAL1
11
12
11
12
P1.6/CEX3
P1.6/CEX3
Pin Descriptions
Mnemonic
VSS
Type
Name and Function
I
I
I
Ground: 0V reference
VCC
Power Supply: This is the power supply voltage for normal, idle and power-down operation.
VREF: A/D converter positive reference input
VREF
RST/VPP
RST/VPP: Reset/Programming Supply Voltage:
A low on this pin for two machine cycles while the oscillator is running, resets the device. This pin
has no pull-up. In order to use the internal power-on reset, an external pull-up resistor must be
connected.
I
This pin also receives the 12V programming pulse which will start the EPROM programming and the
manufacturer test modes.
XTAL1
XTAL2
I
XTAL1 : Input to the inverting oscillator amplifier and input to the internal clock generator circuits
XTAL2 : Output from the inverting oscillator amplifier
O
P1.2 - P1.7
Port 1: Port 1 is an 6-bit programmable I/O port . See Section “Ports”, page 18 for a description of
I/O ports.
I/O
Alternate functions for Port 1 include:
I/O
I/O
I/O
I/O
I/O
I/O
I/O
ECI (P1.2): External Clock for the PCA
CEX0 (P1.3): Capture/Compare External I/O for PCA module 0
CEX1 (P1.4): Capture/Compare External I/O for PCA module 1
CEX2 (P1.5): Capture/Compare External I/O for PCA module 2
CEX3 (P1.6): Capture/Compare External I/O for PCA module 3
CEX4 (P1.7): Capture/Compare External I/O for PCA module 4
P3.0 - P3.3
Port 3: Port 3 is an 6-bit programmable I/O port with internal pull-ups. See Section "Ports", page 18
for a description of I/O ports.
Port 3 also serves the special features of the 80C51 family, as listed below.
I/O
I/O
RXD (P3.0): Serial input port
TXD (P3.1): Serial output port
5
4190A–8051–11/02