BBK 9903S, Service Manual

Page: 25 / 94

MT1379
PRELIMINARY, SUBJECT TO CHANGE WITHOUT NOTICE MTK CONFIDENTIAL, NO DISCLOSURE
Pin Number Symbol Type Description
48 IOA7 Inout
2~16MA, SR
PU
Microcontroller address 7 / IO
49 A16 Output
2~16MA, SR
Flash address 16
50 A17 Output
2~16MA, SR
Flash address 17
51 IOA18 Inout
2~16MA, SR
SMT
Flash address 18 / IO
52 IOA19 Inout
2~16MA, SR
SMT
Flash address 19 / IO
53 IOA20 Inout
2~16MA, SR
SMT
Flash address 20 / IO
OR Videoin Data PortB 0
54 APLLVSS Ground Ground pin for audio clock circuitry
55 APLLVDD3 Power 3.3V Power pin for audio clock circuitry
56 ALE Inout
2~16MA, SR
PU, SMT
Microcontroller address latch enable
57 IOOE# Inout
2~16MA, SR
SMT
Flash output enable, active low / IO
58 IOWR# Inout
2~16MA, SR
SMT
Flash write enable, active low / IO
59 IOCS# Inout
2~16MA, SR
PU, SMT
Flash chip select, active low / IO
60 DVSS Ground Ground pin for internal digital circuitry
61 UP1_2 Inout
4MA, SR
PU, SMT
Microcontroller port 1 -2
62 UP1_3 Inout
4MA, SR
PU, SMT
Microcontroller port 1 -3
63 UP1_4 Inout
4MA, SR
PU, SMT
Microcontroller port 1 -4
64 UP1_5 Inout
4MA, SR
PU, SMT
Microcontroller port 1 -5
65 UP1_6 Inout
4MA, SR
PU, SMT
Microcontroller port 1 -6
66 DVDD3 Power 3.3V power pin for internal digital circuitry