參數(shù)資料
型號: SAF-C509-L
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): 7/74頁
文件大?。?/td> 1607K
代理商: SAF-C509-L
C509-L
Semiconductor Group
6
P9.0 - P9.7
74-77,
5-2
I/O
Port 9
is an 8-bit quasi-bidirectional I/O port with internal pullup
resistors. Port 9 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 9 pins being
externally pulled low will source current (
I
IL
, in the DC
characteristics) because of the internal pullup resistors.
Port 9 can also be switched into a bidirectional mode, in
which CMOS levels are provided. In this bidirectional
mode, each port 1 pin can be programmed individually
as input or output.
Port 9 also serves alternate compare functions. The out-
put 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 9 as follows :
P9.0-P9.7 CC10-CC17
Compare/capture channel 0-7
output/input
XTAL2
12
XTAL2
is the input to the inverting oscillator amplifier and input
to the internal clock generator circuits.
When supplying the C509-L with an external clock
source, XTAL2 should be driven, while XTAL1 is left
unconnected. A duty cycle of 0.4 to 0.6 of the clock
signal is required. Minimum and maximum high and low
times as well as rise/fall times specified in the AC
characteristics must be observed.
XTAL1
13
XTAL1
Output of the inverting oscillator amplifier. This pin is
used for the oscillator operation with crystal or ceramic
resonartor
*) I = Input
O = Output
Table 1
Pin Definitions and Functions (cont’d)
Symbol
Pin Number
I/O*)
Function
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