C541U View Datasheet(PDF) - Siemens AG
Part Name
Description
Manufacturer
C541U Datasheet PDF : 65 Pages
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C540U
C541U
Table 2
Pin Definitions and Functions
Symbol
Pin Numbers
I/O*) Function
P-LCC-44 P-SDIP-52
D+
3
3
I/O USB D+ Data Line
The pin D+ can be directly connected to USB cable
(transceiver is integrated on-chip).
D-
4
4
I/O USB D- Data Line
The pin D- can be directly connected to USB cable
(transceiver is integrated on-chip).
P1.0 - P1.4 5 - 7,
7 - 9, 14, 41, I/O
12, 34, 44 51, 15, 40
5
7
6
8
7
9
12
13
34
41
44
51
–
15
–
40
Port 1
is an 6-bit (P-LCC-44) or 8-bit (P-SDIP-52) quasi-
bidirectional I/O port with internal pullup resistors.
Port 1 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 1 pins
being externally pulled low will source current (I IL,
in the DC characteristics) because of the internal
pullup resistors.
Port 1 also contains two outputs with LED drive
capability as well as the four pins of the SSC
(C541U only). The output latch corresponding to a
secondary function must be programmed to a one
(1) for that function to operate (except when used
for the compare functions). The secondary
functions are assigned to the port 1 pins as follows :
P1.0 / LED0 LED0 output
P1.1 / LED1 LED1 output
P1.2 / SCLK SSC Master Clock Output /
SSC Slave Clock Input (C541U only)
P1.3 / SRI SSC Receive Input (C541U only)
P1.4 / STO SSC Transmit Output (C541U only)
P1.5 / SLS SSC Slave Select Inp. (C541U only)
P1.6
(P-SDIP-52 only)
P1.7
(P-SDIP-52 only)
RESET
10
12
*) I = Input
O = Output
I
RESET
A high level on this pin for the duration of two
machine cycles while the oscillator is running
resets the C540U/C541U. A small internal pulldown
resistor permits power-on reset using only a
capacitor connected to VCC .
Semiconductor Group
8
1997-10-01
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