Pioneer DEH-P90DAB, Service Manual

Page: 104 / 118

104
DEH-P90DAB
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Pin Functions (PD5555A)
Pin No. Pin Name I/O Format Function and Operation
1–4 NC Not used
5 REM I Remote control reception
6 BYTE I External data BUS width select input
7 CNVSS I Processor mode select input
8,9 NC Not used
10 CE I Chip enable
11 XOUT O Crystal oscillating element connection pin
12 VSS GND
13 XIN I Crystal oscillating element connection pin
14 VDD VDD
15
nmi
I NMI input
16 NC Not used
17–20
kd1-4
I Key data 1-4
21–26
ks1-6
I/O C Key strobe input/output 1-6
27–31 NC Not used
32 ILMD O C Dual illumination
33 KYDT O C Key data output
34 DPDT I Display data input
35 NC Not used
36 OEL O C OEL controller ON
37
rdy
I OEL controller ready input
38 NC Not used
39
hold
I Hold input
40
hlda
O C Hold output
41 NC Not used
42
rd
O C Read strobe
43
bhe
O C Write high byte enable
44
wr
O C Write strobe
45
cs3
Not used
46
cs2
O C Bank address (High)
47
cs1
O C Bank address (Low)
48
cs0
O C External ROM chip select
49-59 A19-9 O C Address bus output
60 VDD VDD
61 A8 O C Address bus output
62 VSS GND
63–70 A7-0 O C Address bus output
71–86 D15-0 I/O C Data bus input/output
87–93 NC Not used
94 AVSS Connect to VSS
95 NC Not used
96 VREF I Connect to VSS
97 AVCC Connect to VCC
98-100 NC Not used
Format Meaning
C C MOS
*PD5555A
25
26
50
51
75
76
100
1