PIN DESCRIPTION
Pin No.
40
42
Pin Name
I/O
Descriptions
1
1
DA2
O
D/A converter 2. Open-drain output. External applied voltage can up to 10V.
2
2
DA1
O
D/A converter 1. Open-drain output. External applied voltage can up to 10V.
3
3
DA0
O
D/A converter 0. Open-drain output. External applied voltage can up to 10V.
4
4
/RESET
I
Reset. Active low. Schmitt trigger input, Internal pull high.
5
5
VDD
Power supply (+5V).
6
7
GND
Ground (0V).
7
8
OSCO
O
Oscillator Output. Connects a 8MHz crystal.
8
9
OSCI
I
Oscillator Input. Connects a 8MHz crystal.
9
10
PB5/SDA2
I/O
I/O Port B5 or I²C data pin. This pin can be an I/O port or I²C serial data pin.
10
11
PB4/SCL2
I/O
I/O Port B4 or I²C data pin. This pin can be I/O port or I²C clock pin.
11
12
PB3/PAT
I/O
I/O Port B3 or self-test pattern output. When as an I/O port, it is same as PB5.
When it is configured to test pattern output, a video signal is output.
12
13
PB2
I/O
I/O Port B2. Same as PB0.
13
14
PB1
I/O
I/O Port B1. Same as PB0.
14
15
PB0
I/O
I/O Port B0. When it is an input pin, it has an internal pull-up resistor. When it is an
output pin, the source/sink current is 5mA.
15
16
PB6/IRQ
I/O
I/O Port B6 or Interrupt Request. When as interrupt request input, it has an
internal pull high resistor. When as an I/O port, it is same as PB3.
16
17
PC7
I/O
I/O Port C7. When it is an input pin, it has an internal pull-up resistor. When it is an
output pin, the sink current is 10mA and the source current is 5mA.
17
18
PC6
I/O
I/O Port C6. Same as PC7.
18
19
PC5
I/O
I/O Port C5. Same as PC7.
19
20
PC4
I/O
I/O Port C4. Same as PC7.
20
21
PC3
I/O
I/O Port C3. Same as PC7.
21
22
PC2
I/O
I/O Port C2. Same as PC7.
22
23
PC1/AD1
I/O
I/O Port C1 or A/D converter input 0.
23
24
PC0/AD0
I/O
I/O Port C0 or A/D converter input 1.
24
25
SDA1/PD1
I/O
DDC serial clock or I/O Port D1. When it is a DDC interface pin, It is an open-
drain output. When as an I/O port, it is same as Port B.
25
26
SCLI/PD0
I/O
DDC serial clock or I/O Port D0. When it is a DDC interface pin, It is an open-
drain output. When as an I/O port, it is same as Port B.
26
27
PA0/DA8
I/O
I/O Port A0 or D/A converter 8. This pin can be the output of D/A converter 8
(source /sink = 5mA) or an I/O pin (source = -100uA, sink = 5mA).
27
28
PA1/DA9
I/O
I/O Port A1 or D/A converter 9. Same as PA0/DA8.
28
29
PA2/DA10
I/O
I/O Port A2 or D/A converter 10. Same as PA0/DA8.
29
30
PA3/DA11
I/O
I/O Port A3 or D/A converter 11. Same as PA0/DA8.
30
31
PA4/DA12
I/O
I/O Port A4 or D/A converter 12. Same as PA0/DA8.
31
32
PA5/DA13
I/O
I/O Port A5 or D/A converter 13. Same as PA0/DA8.
32
33
PA6/VSO
I/O
I/O Port A6 / VSYNC OUT. This pin can be the output of VSYNC or an I/O pin.
When as an I/O pin, it is same as PA0.
33
34
PA7/HSO
I/O
I/O Port A7 / HSYNC OUT. This pin can be the output of HSYNC or an I/O pin.
When as an I/O pin, it is same as PA0.
34
35
DA7
O
D/A converter 7. Open-drain output. External applied voltage can up to 10V.
35
36
DA6
O
D/A converter 6. Open-drain output. External applied voltage can up to 10V.
36
38
DA5
O
D/A converter 5. Open-drain output. External applied voltage can up to 10V.
37
39
DA4
O
D/A converter 4. Open-drain output. External applied voltage can up to 10V.
38
40
DA3
O
D/A converter 3. Open-drain output. External applied voltage can up to 10V.
39
41
HSYNC
I
HSYNC input. Schmitt trigger input.
40
42
VSYNC
I
VSYNC input. Schmitt trigger input.
48
Summary of Contents for Diamond Scan 51
Page 9: ...6 MultiSync MV521 Diamand Scan 51 ...
Page 71: ...11 Monolithic triple 13 5nS CRT driver 68 ...
Page 72: ...69 ...
Page 73: ...70 ...
Page 74: ...71 ...
Page 103: ...95 SCHEMATIC DIAGRAMS 1 Video Board ...
Page 104: ...96 2 Main Board ...