C541U Datasheet, PDF (10/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
Table 1
Pin Definitions and Functions (cont’d)
Symbol
Pin I/O*) Function
Numbers
P-LCC-44
ECAP
2
– External Capacitor
This pin is required to be connected to an external capacitor
which is connected to V_SS. The recommended value for the
capacitor is 6.8 nF.
V_DDU
1
– Supply voltage
for the on-chip USB transceiver circuitry
V_DD
8, 23
– Supply voltage
for ports and internal logic circuitry during normal, idle, and power
down mode.
V_SS
9, 22
– Ground (0V)
during normal, idle, and power down mode.
*) I = Input
O = Output
Semiconductor Group
8