DS80C310 Maxim, DS80C310 Datasheet - Page 3

• Manufacturer Part Number: DS80C310
• Description: The DS80C310 is a fast 80C31/80C32-compatible microcontroller
• Manufacturer: Maxim

PIN DESCRIPTION
PDIP
1–8
9
PLCC
2–9
PIN
10
40–44,
TQFP
1, 2, 3
4
P1.0–P1.7
NAME
RST
Port 1 (I/O). Port 1 functions as both an 8-bit bidirectional I/O port
and an alternate functional interface for Timer 2 I/O and new
external interrupts. The reset condition of Port 1 is with all bits at
logic 1. In this state, a weak pullup holds the port high. This
condition also serves as an input mode, since any external circuit
that writes to the port overcomes the weak pullup. When software
writes a 0 to any port pin, the DS80C310 activates a strong pulldown
that remains on until either a 1 is written or a reset occurs. Writing a
1 after the port has been at 0 causes a strong transition driver to turn
on, followed by a weaker sustaining pullup. Once the momentary
strong driver turns off, the port once again becomes the output high
(and input) state. The alternate modes of Port 1 are outlined as
follows:
PDIP PLCC TQFP
Reset (Input). The RST input pin contains a Schmitt voltage input to
recognize external active-high reset inputs. The pin also employs an
internal pulldown resistor to allow for a combination of wired-OR
external reset sources.
1
2
3
4
5
6
7
8
3 of 22
PIN
2
3
4
5
6
7
8
9
40
41
42
43
44
1
2
3
PORT ALTERNATE
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
FUNCTION
T2EX
INT2
INT4
INT3
INT5
T2
—
—
External I/O for
Timer/Counter 2
Timer/Counter 2
Capture/Reload
Trigger
DS80C320 has a serial
port RXD
DS80C320 has a serial
port TXD
External Interrupt 2
(Positive Edge Detect)
External Interrupt 3
(Negative Edge
Detect)
External Interrupt 4
(Positive Edge Detect)
External Interrupt 5
(Negative Edge
Detect)
FUNCTION
DS80C310