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Q67121-C1066 데이터시트(PDF) 8 Page - Siemens Semiconductor Group

부품명 Q67121-C1066
상세설명  8-Bit CMOS Microcontroller
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제조업체  SIEMENS [Siemens Semiconductor Group]
홈페이지  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

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C515C
Semiconductor Group
8
1997-07-01
P3.0-P3.7
15-22
15
16
17
18
19
20
21
22
I/O
Port 3
is an 8-bit quasi-bidirectional I/O port with internal pullup
resistors. Port 3 pins that have 1's written to them are
pulled high by the internal pullup 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 pullup resistors.
Port 3 also contains the interrupt, timer, serial port 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:
P3.0
RXD
Receiver data input (asynch.) or
data input/output (synch.) of serial
interface
P3.1
TXD
Transmitter data output (asynch.) or
clock output (synch.) of serial
interface
P3.2
INT0
External interrupt 0 input / timer 0
gate control input
P3.3
INT1
External interrupt 1 input / timer 1
gate control input
P3.4
T0
Timer 0 counter input
P3.5
T1
Timer 1 counter input
P3.6
WR
WR control output; latches the data
byte from port 0 into the external
data memory
P3.7
RD
RD control output; enables the
external data memory
*) I = Input
O = Output
Table 1
Pin Definitions and Functions (cont’d)
Symbol
Pin Number
I/O*)
Function
P-MQFP-80


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