DS80C310-ECL Dallas Semiconducotr, DS80C310-ECL Datasheet - Page 4

• Manufacturer Part Number: DS80C310-ECL
• Description: High-Speed Micro
• Manufacturer: Dallas Semiconducotr

10-17
DIP
21
22
23
24
25
26
27
28
10
11
12
13
14
15
16
17
31
1
2
3
4
5
6
7
8
-
PLCC
13-19
11,
24
25
26
27
28
29
30
31
11
13
14
15
16
17
18
19
35
12
34
2
3
4
5
6
7
8
9
TQFP
5,7-13
40
41
42
43
44
18
19
20
21
22
23
24
25
10
11
12
13
29
28
1
2
3
5
7
8
9
6
A10(P2.2)
A11(P2.3)
A12(P2.4)
A14(P2.6)
A15(P2.7)
A13 P2.5)
A8 (P2.0)
A9 (P2.1)
SIGNAL
P3.0-3.7
NAME
EA
NC
Port
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
A8-15 (Port 2) -Output. Port 2 serves as the MSB for external
addressing. P2.7 is A15 and P2.0 is A8. The DS80C310 will
automatically place the MSB of an address on P2 for external
ROM and RAM access. Although Port 2 can be accessed like
an ordinary I/O port, the value stored on the Port 2 latch will
never be seen on the pins (due to memory access). Therefore
writing to Port 2 in software is only useful for the instructions
MOVX A, @ Ri or MOVX @ Ri, A. These instructions use the
Port 2 internal latch to supply the external address MSB; the
Port 2 latch value will be supplied as the address information.
Port 3 - I/O. Port 3 functions as both an 8-bit bidirectional I/O
port and an alternate functional interface for external Interrupts,
Serial Port 0, Timer 0 and 1 Inputs,
reset condition of Port 3 is with all bits at a 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 will overcome the weak pullup. When software
writes a 0 to any port pin, the DS80C310 will activate 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 will cause 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 both the output high and input
state. The alternate modes of Port 3 are outlined below.
Port
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
operation.
NC - Reserved. These pins should not be connected. They
are reserved for use with future devices in this family.
EA - Input. This pin must be connected to ground for proper
Alternate Function
T2
T2EX
none
none
INT2
INT4
Alternate
RXD0
TXD0
T0
T1
INT3
INT5
INT0
INT1
WR
RD
4 of 23
External I/O for Timer/Counter 2
Timer/Counter 2 Capture/Reload Trigger
External Interrupt 3 (Negative Edge Detect)
External Interrupt 5 (Negative Edge Detect)
External Interrupt 2 (Positive Edge Detect)
External Interrupt 4 (Positive Edge Detect)
(DS80C320 has a serial port RXD)
(DS80C320 has a serial port TXD)
Mode
Serial Port 0 Input
Serial Port 0 Output
External Interrupt 0
External Interrupt 1
Timer 0 External Input
Timer 1 External Input
External Data Memory Write Strobe
External Data Memory Read Strobe
DESCRIPTION
RD
and
WR
DS87C520/DS83C520
strobes. The