Akai ADP-841, Service Manual

Page: 19 / 39

MT1389 B/ C
PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MTK CONFIDENTIAL, NO DISCLOSURE
6
MTK Confidential A
FOR SZ_MTK USE ONLY
Pin Main Alt. Type Description
77 IOCS#
Inout
2~16MA, SR
PU, SMT
Flash chip select, active low / IO
95 UWR#
Inout
2~16MA, SR
PU, SMT
Microcontroller write strobe, active low
96 URD#
Inout
2~16MA, SR
PU, SMT
Microcontroller read strobe, active low
98 UP1_2
Inout
4MA, SR
PU, SMT Microcontroller port 1-2
99 UP1_3
Inout
4MA, SR
PU, SMT Microcontroller port 1-3
100 UP1_4
Inout
4MA, SR
PU, SMT Microcontroller port 1-4
101 UP1_5
Inout
4MA, SR
PU, SMT Microcontroller port 1-5
102 UP1_6 SCL
Inout
4MA, SR
PU, SMT
1) Microcontroller port 1-6
2) I
2
C clock pin
103 UP1_7 SDA
Inout
4MA, SR
PU, SMT
1) Microcontroller port 1-7
2) I
2
C data pin
104 UP3_0 RXD
Inout
4MA, SR
PU, SMT
1) Microcontroller port 3-0
2) 8032 RS232 RXD
105 UP3_1 TXD
Inout
4MA, SR
PU, SMT
1) Microcontroller port 3-1
2) 8032 RS232 TXD
106 UP3_4
RXD
SCL
Inout
4MA, SR
PU, SMT
1) Microcontroller port 3-4
2) Hardwired RD232 RXD
3) I
2
C clock pin
107 UP3_5
TXD
SDA
Inout
4MA, SR
PU, SMT
1) Microcontroller port 3-5
2) Hardwired RD232 TXD
3) I
2
C data pin
111 IR
Input
SMT
IR control signal input
112 INT0#
Inout
2~16MA, SR
PU, SMT
Microcontroller external interrupt 0, active low
Audio interface ( 14 )