T89C5115 ATMEL Corporation, T89C5115 Datasheet - Page 4

• Manufacturer Part Number: T89C5115
• Description: Low Pin Count 8-bit MCU with A/D Converter and 16-Kbytes of Flash Memory
• Manufacturer: ATMEL Corporation

4
T89C5115
Table 1. Pin Description
Pin Name
VAGND
VAREF
VAVCC
P1.0:7
P2.0:7
VCC
VSS
Type
GND
I/O
I/O
Description
Circuit ground
Supply Voltage
Reference Voltage for ADC
Supply Voltage for ADC
Reference Ground for ADC
Port 1:
Is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 pins can be used for
digital input/output or as analog inputs for the Analog Digital Converter (ADC). Port 1
pins that have 1’s written to them are pulled high by the internal pull-up transistors
and can be used as inputs in this state. As inputs, Port 1 pins that are being pulled
low externally will be the source of current (I
because of the internal pull-ups. Port 1 pins are assigned to be used as analog
inputs via the ADCCF register (in this case the internal pull-ups are disconnected).
As a secondary digital function, port 1 contains the Timer 2 external trigger and clock
input; the PCA external clock input and the PCA module I/O.
P1.0/AN0/T2
Analog input channel 0,
External clock input for Timer/counter2.
P1.1/AN1/T2EX
Analog input channel 1,
Trigger input for Timer/counter2.
P1.2/AN2/ECI
Analog input channel 2,
PCA external clock input.
P1.3/AN3/CEX0
Analog input channel 3,
PCA module 0 Entry of input/PWM output.
P1.4/AN4/CEX1
Analog input channel 4,
PCA module 1 Entry of input/PWM output.
P1.5/AN5
Analog input channel 5,
P1.6/AN6
Analog input channel 6,
P1.7/AN7
Analog input channel 7,
It can drive CMOS inputs without external pull-ups.
Port 2:
Is an 2-bit bi-directional I/O port with internal pull-ups. Port 2 pins that have 1’s
written to them are pulled high by the internal pull-ups and can be used as inputs in
this state. As inputs, Port 2 pins that are being pulled low externally will be a source
of current (IIL, on the datasheet) because of the internal pull-ups.
In the T89C51CC02 Port 2 can sink or source 5 mA. It can drive CMOS inputs
without external pull-ups.
IL
, see section "Electrical Characteristic")
4128A–8051–04/02