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參數(shù)資料
| 型號： | SAB80C517A-N18 |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Single-Chip Microcontroller |
| 中文描述： | 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84 |
| 文件頁數(shù)： | 10/77頁 |
| 文件大?。?/td> | 1358K |
| 代理商： | SAB80C517A-N18 |
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SAB 80C517A/83C517A-5
Semiconductor Group
9
1994-05-01
Pin Definitions and Functions
(cont’d)
Symbol
Pin Number
I/O
*)
Function
P-LCC-84
P-MQFP-100-2
P3.0 - P3.7 21 - 28
90 - 97
I/O
Port 3
is a bidirectional I/O port with internal pull-
up resistors. Port 3 pins that have 1 s
written to them are pulled high by the
internal pull-up resistors, and in that state
can be used as inputs. As inputs, port 3
pins being externally pulled low will source
current (
I
IL,
in the DC characteristics)
because of the internal pull-up resistors.
Port 3 also contains the interrupt, timer,
serial port 0 and external memory strobe
pins that are used by various options. The
output latch corresponding to a secondary
function must be programmed to a one (1)
for that function to operate.
The secondary functions are assigned to
the pins of port 3, as follows:
– R
×
D0 (P3.0): receiver data input
(asynchronous) or data input/output
(synchronous) of serial interface
– T
×
D0 (P3.1): transmitter data output
(asynchronous) or clock output
(synchronous) of serial interface 0
– INT0 (P3.2):
interrupt 0 input/timer 0
gate control
– INT1 (P3.3):
interrupt 1 input/timer 1
gate control
– T0 (P3.4):
counter 0 input
– T1 (P3.5):
counter 1 input
– WR (P3.6):
the write control signal
latches the data byte from port 0 into the
external data memory
– RD (P3.7):
the read control signal
enables the external data memory to
port 0
*
I = Input
O = Output
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