Canon D78-5532, Service Manual, Page: 72 / 119

Part 4: Troubleshooting
4-10
2. CONTROL PORT FUNCTIONS
2.1 System Control & I/O Port Table (IC301)
178 Port A7 LAMP_PWM PWM Output to Sub-CPU PWM O
115 Port A6 MUPO_ON I
44 Port A5 M_SCL1 I/O
116 Port A4 M_SDA1 O
45 Port A3 M_SCL2 I/O
46 Port A2 M_SDA2 O
117 Port A1 SCLK 3 Line Serial Bus Clock O
180 Port A0 SDATA 3 Line Serial Bus Data O
173 Port B7 NMI Reset SW Input I
111 Port B6 IRM_STB 3 Line Serial Bus Strobe O
40 Port B5 3L_EN 3 Line Serial Bus Enable O
174 Port B4 POWER_FAIL Power Fail Detection Error = L I
41 Port B3 A23 Address Bus 23
175 Port B2 A22 Address Bus 22
112 Port B1 A21 Address Bus 21
229 Port B0 A20 Address Bus 20
71 Port E7 ON_5VA Standby 5V OFF Standby = L O
139 Port E6 DCLK_SW O
200 Port E5 VHDPEN IC101 Video Decoder Enable O
140 Port E4 LAMP_POW Lamp ON to Sub-CPU Lamp-ON = H O
201 Port E3 USB_VBUS USB Connector Detection Not used I
141 Port E2 USB_RST USB Device Reset Output O
72 Port E1 ON_15V Standby 15V OFF Standby = L O
142 Port E0 USB_EN USB Device Enable Output O
119 Port F7 IRRCVR1 IR Receiver Input 1 Not used I
182 Port F6 IRRCVR0 IR Receiver Input 0 I
47 Port F5 RXD I
181 Port F4 TXD O
189 Port F3 CS0 I/O Expander Chip Select (Output) O
55 Port F2 CS1 I/O Expander Chip Select (Input) O
207 Port F1 DCLKEXT D-port Clock External Input Not used I
257 Port F0 MCLKEXT Memory System Clock Input Not used I
194 A19 A19 Address Bus 19
63 A19 A18 Address Bus 18
132 A17 A17 Address Bus 17
62 A16 A16 Address Bus 16
61 A15 A15 Address Bus 15
131 A14 A14 Address Bus 14
193 A13 A13 Address Bus 13
247 A12 A12 Address Bus 12
60 A11 A11 Address Bus 11
246 A10 A10 Address Bus 10
59 A9 A9 Address Bus 9
130 A8 A8 Address Bus 8
129 A7 A7 Address Bus 7
192 A6 A6 Address Bus 6
128 A5 A5 Address Bus 5
58 A4 A4 Address Bus 4
191 A3 A3 Address Bus 3
190 A2 A2 Address Bus 2
245 A1 A1 Address Bus 1
244 A0 A0 Address Bus 0
242 D15 D15 Data Bus 15 I/O
241 D14 D14 Data Bus 14 I/O
187 D13 D13 Data Bus 13 I/O
53 D12 D12 Data Bus 12 I/O
124 D11 D11 Data Bus 11 I/O
186 D10 D10 Data Bus 10 I/O
240 D9 D9 Data Bus 9 I/O
123 D8 D8 Data Bus 8 I/O
185 D7 D7 Data Bus 7 I/O
122 D6 D6 Data Bus 6 I/O
51 D5 D5 Data Bus 5 I/O
Pin No. Name Function Name Function Polarity I/O