M37281EKSP Datasheet, PDF (8/172 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M37281MAH–XXXSP,M37281MFH–XXXSP,M37281MKH–XXXSP, M37281EKSP
Table 7.2 Pin Description (continued)
Pin
Name
P52/R/R1,
P53/G/G1,
P54/B/B1,
P55/OUT1
P63/OSC1/
XCIN,
P64/OSC2/
XCOUT
P70/CVIN,
P71/VHOLD,
P72/(SIN)
Output port P5
OSD output
Input port P6
Clock input for OSD
Clock output for OSD
Sub-clock input
Sub-clock output
Input port P7
Input for data
slicer
HLF/AD6
Serial I/O data input
I/O for data slicer
HSYNC
VSYNC
Analog input
HSYNC input
VSYNC input
Input/
Output
Output
Output
Input
Input
Output
Input
Output
Input
Input
Input
I/O
Input
Input
Input
Functions
Port P5 is a 4-bit output port. The output structure is CMOS output.
Pins P52–P55 are also used as OSD output pins R/R1, G/G1, B/B1, OUT1 respectively. At
R, G, B output, the output structure is analog output. At R1, G1, B1 and OUT1 output, the
output structure is CMOS output.
Ports P63 and P64 are 2-bit input port.
Pin P63 is also used as OSD clock input pin OSC1.
Pin P64 is also used as OSD clock output pin OSC2. The output structure is CMOS output.
Pin P63 is also used as sub-clock input pin XCIN.
Pin P64 is also used as sub-clock output pin XCOUT. The output structure is CMOS output.
Ports P70–P72 are 3-bit input port.
Pins P70, P71 are also used as data slicer input pins CVIN, VHOLD respectively. When using
data slicer, input composite video signal through a capacitor. Connect a capacitor between
VHOLD and VSS.
Pins P72 is also used as serial I/O data input pin SIN.
When using data slicer, connect a filter using of a capacitor and a resistor between HLF and
VSS.
This is an analog input pin AD6 .
This is a horizontal synchronous signal input for OSD.
This is a vertical synchronous signal input for OSD.
Note : Port Pi (i = 0 to 3) has the port Pi direction register (address 00C116 of zero page) which can be used to program each bit as an input (“0”) or an output (“1”).
The pins programmed as “1” in the direction register are output pins. When pins are programmed as “0,” they are input pins. When pins are programmed as
output pins, the output data are written into the port latch and then output. When data is read from the output pins, the output pin level is not read but the data
of the port latch is read. This allows a previously-output value to be read correctly even if the output “L” voltage has risen, for example, because a light emitting
diode was directly driven. The input pins float, so the values of the pins can be read. When data is written into the input pin, it is written only into the port latch,
while the pin remains in the floating state.
Rev.1.01 2003.07.16 page 8 of 170