C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 13

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Table 1-1
Pin Definitions and Functions
Symbol
P4.0
P4.1
XTAL2
XTAL1
*) I = Input
Semiconductor Group
O = Output
Pin Number
6
28
14
15
I/O*)
I/O
I/O
O
I
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 ( I
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 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 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.
1-7
Transmitter output of CAN controller
Receiver input of CAN controller
C505 / C505C
Introduction
IL
, in the DC
1997-08-01