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7542 Group
(2) Standard serial I/O mode 2
Table 14 Description of pin function (standard serial I/O mode 2)
Pin name
Signal name
V
,V
Power supply
CC
SS
CNV
CNV
SS
RESET
Reset input
X
Clock input
IN
X
Clock output
OUT
V
Reference voltage input
REF
P0
–P0
I/O port P0
0
3
P0
RxD input
4
P0
TxD output
5
P0
S
6
CLK
P0
BUSY output
7
P1
–P1
I/O port P1
0
4
P2
–P2
I/O port P2
0
7
P3
, P3
, P3
–P3
I/O port P3
0
1
3
6
P3
CE input
2
P3
RP input
7
Rev.3.02
Oct 31, 2006
REJ03B0006-0302
I/O
I
I
SS
I
I
O
I
I/O
I
O
input
I
O
I/O
I/O
I/O
I
I
Page 90 of 134
Apply 2.7 to 5.5 V to the Vcc pin and 0 V to the Vss pin.
After input of port is set, input "H" level.
Reset input pin. System operates when RESET pin is set to "H" level after
CNVss pin is set to "H" level.
Connect an oscillation circuit between the X
As for the connection method, refer to the "clock generating circuit".
(When system operates only by the on-chip oscillator, an external circuit is not
required.)
Apply reference voltage of A/D to this pin.
Input "L" or "H" level, or keep open.
Serial data input pin.
Serial data output pin.
Input "L" level.
BUSY signal output pin.
Input "L" or "H" level, or keep open.
Input "L" or "H" level, or keep open.
Input "L" or "H" level, or keep open.
Input "H" level.
Input "L" level.
I
Function
and X
pins.
IN
OUT
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