C541U_99 Datasheet, PDF (52/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER

On-Chip Peripheral Components
C541U
Delay = 1 State
V_CC
=1
1
Q
Tristate
Input Data (Read Pin)
1
p1
p2
&
n1
1
V_SS
=1
=1
p3
Port
Pin
MCS02433
Figure 6-5
Driver Circuit of Port 1 pins P1.3 and P1.5 (when used for SRI and SLS)
When enabling the SSC, inputs used for the SSC will be switched into a high-impedance mode. For
P1.3/SRI, Tristate will be enabled, when the SSC is enabled. For P1.5/SLS, Tristate will be enabled,
when the SSC is enabled and is switched to slave mode. In master mode this pin will remain a
regular I/O pin.
Semiconductor Group
6-7
1999-04-01