External Signals
MOTOROLA
MPC823 USER’S MANUAL
2-11
EXTERNAL
SIGNALS
2
PD[15]
LD8
VD7
R4
General-Purpose I/O Port D Bit 15—Bit 15 of the general-purpose I/O port D.
LD8—One of the 12 data bus bits used to drive the LCD panel.
VD7—One of the data bus bits of the video controller used for driving the video
encoder.
PD[14]
LD7
VD6
T3
General-Purpose I/O Port D Bit 14—Bit 14 of the general-purpose I/O port D.
LD7—One of the 12 data bus bits used to drive the LCD panel.
VD6—One of the data bus bits of the video controller used for driving the video
encoder.
PD[13]
LD6
VD5
P5
General-Purpose I/O Port D Bit 13—Bit 13 of the general-purpose I/O port D.
LD6—One of the 12 data bus bits used to drive the LCD panel.
VD5—One of the data bus bits of the video controller used for driving the video
encoder.
PD[12]
LD5
VD4
R3
General-Purpose I/O Port D Bit 12—Bit 12 of the general-purpose I/O port D.
LD5—One of the 12 data bus bits used to drive the LCD panel.
VD4—One of the data bus bits of the video controller used for driving the video
encoder.
PD[11]
LD4
VD3
N5
General-Purpose I/O Port D Bit 11—Bit 11 of the general-purpose I/O port D.
LD4—One of the 12 data bus bits used to drive the LCD panel.
VD3—One of the data bus bits of the video controller used for driving the video
encoder.
PD[10]
LD3
VD2
T2
General-Purpose I/O Port D Bit 10—Bit 10 of the general-purpose I/O port D.
LD3—One of the 12 data bus bits used to drive the LCD panel.
VD2—One of the data bus bits of the video controller used for driving the video
encoder.
PD[9]
LD2
VD1
P4
General-Purpose I/O Port D Bit 9—Bit 9 of the general-purpose I/O port D.
LD2—One of the 12 data bus bits used to drive the LCD panel.
VD1—One of the data bus bits of the video controller used for driving the video
encoder.
PD[8]
LD1
VD0
T1
General-Purpose I/O Port D Bit 8—Bit 8 of the general-purpose I/O port D.
LD1—One of the 12 data bus bits used to drive the LCD panel.
VD0—One of the data bus bits of the video controller used for driving the video
encoder.
PD[7]
LD0
FIELD
R2
General-Purpose I/O Port D Bit 7—Bit 7 of the general-purpose I/O port D.
LD0—One of the 12 data bus bits used to drive the LCD panel.
FIELD—The line the video controller uses to signal which of the two fields is the
current one.
PD[6]
LCD_AC
LOE
BLANK
R1
General-Purpose I/O Port D Bit 6—Bit 6 of the general-purpose I/O port D.
LCD_AC—This output signal from the LCD controller toggles once every
programmable number of frames. It is used with passive panels.
LOE—The output enable signal that is used with TFT panels.
BLANK—The video controller uses this signal to let the video encoder know that the
current cycle is a blank type.
PD[5]
FRAME
VSYNC
P2
General-Purpose I/O Port D Bit 5—Bit 5 of the general-purpose I/O port D.
FRAME—The output signal from the video controller that marks the beginning of a
new frame.
VSYNC—The output signal from the LCD controller that marks the beginning of a
new frame.
PD[4]
LOAD
HSYNC
P3
General-Purpose I/O Port D Bit 4—Bit 4 of the general-purpose I/O port D.
LOAD—The output signal from the video controller that marks the beginning of a
new display line.
HSYNC—The output signal from the LCD controller that marks the beginning of a
new frame.
Table 2-1. Signal Descriptions (Continued)
SIGNAL
PIN NUMBER
DESCRIPTION