User’s Manual
1-7
05.99
Introduction
C513AO
1.2
Pin Definitions and Functions
This section describes all external signals to the C513AO and their functions.
.
Table 1-1
Pin Definitions and Functions
Symbol Pin Number
I/O
*)
Function
P-D
IP-40
P-LC
C
-44
P-M
Q
F
P-44
P1.7-
P1.0
8-1
1
2
3
4
5
6
9-2
2
3
4
5
6
7
3-1,
44-40
40
41
42
43
44
1
I/O Port 1
Port 1 is an 8-bit quasi-bidirectional port with internal pull-
up arrangement. Port 1 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 1 pins
being externally pulled low will source current (
I
IL
, in the
DC characteristics) because of the internal pull-up
transistors.
The output latch corresponding to a secondary function
must be programmed to a “1” for that function to operate.
For the outputs of the Synchronous Serial Channel (SSC),
SCLK and STO, special circuitry is implemented providing
true push-pull capability. The STO output, in addition, will
have true tristate capability. When used for SSC inputs,
the pull-up transistors will be switched off and the inputs
float (high ohm inputs).
The secondary functions are assigned to the pins of Port 1
as follows:
P1.0 / T2
Input to Counter 2
P1.1 / T2EX
Capture/reload trigger of Timer 2
Up-Down count
P1.2 / SCLK
SSC Master Clock Output
SSC Slave Clock Input
P1.3 / SRI
SSC Receive Input
P1.4 / STO
SSC Transmit Output
P1.5 / SLS
Slave Select Input
*)
I = Input
O = Output
