C501G-1E SIEMENS [Siemens Semiconductor Group], C501G-1E Datasheet - Page 42
C501G-1E
Manufacturer Part Number
C501G-1E
Description
8-Bit Single-Chip Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.C501G-1E.pdf
(121 pages)
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6.1.2
The pins of ports 1 and 3 are multifunctional. They are port pins and also serve to implement special
features as listed in table 6-4.
Figure 6-9 shows a functional diagram of a port latch with alternate function. To pass the alternate
function to the output pin and vice versa, however, the gate between the latch and driver circuit must
be open. Thus, to use the alternate input or output functions, the corresponding bit latch in the port
SFR has to contain a one (1); otherwise the pulldown FET is on and the port pin is stuck at 0. After
reset all port latches contain ones (1).
Figure 6-9
Circuitry of Ports 1 and 3
Semiconductor Group
Alternate Functions
Int. Bus
Latch
Latch
Read
Write
Read
to
Pin
D
CLK
Bit
Latch
Alternate
Function
Input
Q
Q
6-8
Alternate
Function
Output
On-Chip Peripheral Components
&
MCS01827
V
CC
Internal
Pull Up
Arrangement
Pin
C501
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