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XC-1A Hardware Manual (1.2)
To reduce the number of pins required for the 12 clock-LEDs, the LED anodes are
connected to four 8-bit ports (8D) on processor 0, 1, 2 and 3 and the cathodes are
connected to two 1-bit ports (1E for green, 1F for red) on processor 0.
The schematic for the clock-LEDs is shown below
I
II
X0D40 X0D41 X0D42
PORT_CLOCKLED_0
PORT_CLOCKLED_SELR
0
0
1
1
To get yellow, alternate green/red in 4:1 ratio
IX
VI
III
III
IIII
V
X1D40
X1D41 X1D42 X2D40
PORT_CLOCKLED_1
PORT_CLOCKLED_SELG
0
1
0
1
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G
C
G
B
VI
VII
VIII
X2D41 X2D42 X3D40
PORT_CLOCKLED_2
Colour
PORT_CLOCKLED_SELG
Off
Green
Red
PORT_CLOCKLED_SELR
Red
G
D
A
G
IX
X
XI
X3D41
X3D42
PORT_CLOCKLED_3
X0D12
X0D13
4/18
XII
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