UPSD3254 STMICROELECTRONICS [STMicroelectronics], UPSD3254 Datasheet - Page 16

• Manufacturer Part Number: UPSD3254
• Description: Flash Programmable System Devices with 8032 Microcontroller Core
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
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Port Pin
P4.3
P4.4
P4.5
P4.6
P4.7
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
RESET_
PSEN_
AVREF
Signal
PWM0
PWM1
PWM2
PWM3
PWM4
XTAL1
XTAL2
Name
USB+
USB-
WR_
RD_
ALE
Pin No.
27
25
23
19
18
10
70
65
62
63
68
48
49
35
34
32
28
26
24
22
21
8
4
In/Out
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
I
I
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
USB Pin. Pull-up resistor required
(2k
devices) for all devices, with or
without USB function.
USB Pin. Pin is not connected for
device with no USB function.
Reference Voltage input for ADC
READ signal, external bus
WRITE signal, external bus
PSEN signal, external bus
Address Latch signal, external bus
Active low RESET input
Oscillator input pin for system clock
Oscillator output pin for system clock
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
General I/O port pin
for 3V devices, 7.5k
Basic
for 5V
Function
8-bit Pulse Width Modulation
output 0
8-bit Pulse Width Modulation
output 1
8-bit Pulse Width Modulation
output 2
8-bit Pulse Width Modulation
output 3
Programmable 8-bit Pulse Width
modulation output 4
1. PLD Macro-cell outputs
2. PLD inputs
3. Latched Address Out (A0-A7)
4. Peripheral I/O Mode
Alternate