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參數(shù)資料
| 型號： | Q67126-C2042 |
| 廠商： | SIEMENS AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 9/65頁 |
| 文件大?。?/td> | 427K |
| 代理商： | Q67126-C2042 |
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Semiconductor Group
9
1997-10-01
C540U
C541U
P3.0 - P3.7
11, 13 - 19 13, 16 - 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 / LED2
LED2 output
P3.1 / DADD
Device attached input
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
XTAL2
20
23
–
XTAL2
is the output of the inverting oscillator amplifier.
This pin is used for the oscillator operation with
crystal or ceramic resonator.
XTAL1
21
24
–
XTAL1
is the input to the inverting oscillator amplifier and
input to the internal clock generator circuits.
To drive the device from an external clock source,
XTAL1 should be driven, while XTAL2 is left
unconnected.
Minimum and maximum high and
low times as well as rise/fall times specified in the
AC characteristics must be observed.
*) I = Input
O = Output
Table 2
Pin Definitions and Functions (cont’d)
Symbol
Pin Numbers
I/O*) Function
P-LCC-44
P-SDIP-52
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相關代理商/技術參數(shù) |
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| Q67127-C1030 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| Q67127-C1031 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
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