參數(shù)資料
型號(hào): DS89C420-ECL
英文描述: Ultra-High-Speed Microcontroller
中文描述: 超高速微控制器
文件頁(yè)數(shù): 6/59頁(yè)
文件大?。?/td> 539K
代理商: DS89C420-ECL
DS89C420
6 of 59
PIN
PLCC
11, 13–
19
DIP
10–17
TQFP
5, 7–13
NAME
FUNCTION
P3.0–P3.7
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, and
RD
and
WR
strobes. The
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
overcomes the weak pullup. When software writes a 0 to any
port pin, the DS89C420 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 again becomes both
the output high and input state. The alternate modes of Port 3
are outlined below.
10
11
12
13
14
15
16
17
31
11
13
14
15
16
17
18
19
35
5
7
8
9
10
11
12
13
29
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
PORT
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
ALTERNATE FUNCTION
RXD0 Serial Port 0 Receive
TXD0 Serial Port 0 Transmit
INT0
External Interrupt 0
INT1
External Interrupt 1
T0
Timer 0 External Input
T1
Timer 1 External Input
WR
External Data Memory Write Strobe
P3.7
RD
External Data Memory Read Strobe
EA
External Access.
Allows selection of internal or external
program memory. Connect to ground to force the DS89C420 to
use an external memory-program memory. The internal RAM
is still accessible as determined by register settings. Connect to
V
CC
to use internal flash memory.
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