SAF-C505-2RM Siemens Semiconductor Group, SAF-C505-2RM Datasheet - Page 10
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SAF-C505-2RM
Manufacturer Part Number
SAF-C505-2RM
Description
8-Bit CMOS Microcontroller
Manufacturer
Siemens Semiconductor Group
Datasheet
1.SAF-C505-2RM.pdf
(85 pages)
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Table 3
Pin Definitions and Functions (cont’d)
Symbol
P4.0
P4.1
XTAL2
XTAL1
*) I = Input
Semiconductor Group
O = Output
Pin Number
6
28
14
15
*)
I/O
I/O
O
I
I/O
Function
Port 4
is a 2-bit quasi-bidirectional port with internal pull-up
arrangement. Port 4 pins that have 1’s written to them are
pulled high by the internal pull-up transistors and in that
state can be used as inputs. As inputs, port 4 pins being
externally pulled low will source current (
characteristics) because of the internal pullup transistors.
The output latch corresponding to the secondary function
RXDC must be programmed to a one (1) for that function to
operate. The secondary functions are assigned to the two
pins of port 4 as follows (C505C and C505CA only) :
P4.0 / TXDC
P4.1 / RXDC
XTAL2
Output of the inverting oscillator amplifier.
XTAL1
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. To
operate above a frequency of 16 MHz, a duty cycle of the
etxernal clock signal of 50 % should be maintained.
Minimum and maximum high and low times as well as rise/
fall times specified in the AC characteristics must be
observed.
10
Transmitter output of CAN controller
Receiver input of CAN controller
C505A / C505CA
C505 / C505C
I
IL
, in the DC
1997-12-01
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