Aiwa CT-X2058 Service Manual page 11

1C, TC9321F
Pin No. Pin Name
1 - 4 P6-1 - P6-4
5 - 8
P7-1 - P7-4
9 - 1 0 P8-1 ~ P8-2
11 - 18 T 0 - T 7
19-22 OT1 - OT4
23
N. C
2 4-27 K 0 - K 3
28-31 P4-4 -P4-1
32
P3-3/ADIN2/DAOUT
33
P3-2/ADIN1
34 P3-1/DC-REF
35 P2-4/STB
36 P2-3/CK
37 P2-2/SO
38 P2-1/S1
3 9-42
P1-4-P1-1
I/O
I/O
4-bit x 2 (P6-1 - P7-4) and 2-bit (P8-1 - P8-2) I/O ports. These ports can designate
I/O
inputs and outputs for every bit: the designation is executed by the contents of the
I/O internal ports called PORT-6 - PORT-8 I/O C O N T R O L. (See notes 1-3)
4-bit (TO - T3) and 4-bit (T4 - T7) output port. These pins are usually used as the key
O
return timing output signals of key matrix. (See notes 2 and 3)
o
4-bit output port. (See notes 2 and 3)
Since this pin is not connected to any internal chip, it can be open or connected to
G N D or V D D . W ith TC93P21F O TP product, this pin is a Vp-p terminal.
Therefore, if it is connected to VD D , TC93P21F can be used as it is.
4-bit input port for key matrix input. When a key command which designates this port
is executed for the operand, the data of these pins w ill be written to the R A M . A ll pins
1
have pull-down resistors. The TO - T7 output port is usually used for the key return
timing signal outputs
4-bit (P4-1 - P4-4) I/O port. This port can designate inputs and outputs for every bit:
I/O the designation is executed by the contents of the internal port called PORT-4 I/O
C O N T R O L. (See notes 1 - 3)
3-bit I/O port.
This port can designate inputs and outputs for every bit: the designation is executed by
I/O
the contents of the internal port called PORT-3 I/O C O N T R O L. These pins are also
used as the analog inputs of the built-in 6-bit, 2-channel A/D converter as w ell as the
analog output of the 1-channel D/A converter. Switching between A/D and D/A
converter inputs/output is controlled by the contents of the A D O N , D A O N and
A D S E L bits. The built-in A/D converter uses a sequential comparison method with
I
program: P3-1 is a reference voltage input, P3-2 is an analog comparison voltage input,
and P3-3 is an analog comparison voltage input or analog voltage output.
Note: The ladder resistor which generates an internal D/A reference voltage is
commonly used for A/D and D/A converters. When the A/D and D/A converters are
used simultaneously, the D A O N bit is set to "0" and the D/A output is set to high
I
impedance during A/D conversion. Therefore, the voltage must be maintained by a
capacitor, etc.
(See notes 1 - 3 )
4-bit I/O port. This port can designate inputs and outputs for every bit: the designation
O
is executed by the contents of the internal port called PORT-2 I/O C O N T R O L. This
port is commonly used with serial interface (S IO ). Switching of S IO is controlled by
O
the content of the SIO ON bit. If this serial interface is used, the peripheral optional
IC s can be firm ly controlled when the S IO command is executed. The serial transfer
o
format can be selected by program from two modes: NCD/NCD.W hen the N C D mode
is selected, the P2-4/STB and P2-1/S1 pins can be used as the P2-4 and P2-1 I/O ports.
I
(See notes 1 ~ 3)
4-bit (Pl-1 - P I -4) I/O port. This port can designate inputs and outputs for every bit:
I/O the designation is executed by the contents of the internal port called PORT-1 I/O
C O N T R O L. (See notes 1 - 3)
15
Description