UPD784915AGF View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD784915AGF

16-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784915A, 784916A

3.5 Real-time Output Port

A real-time output port consists of a port output latch and a buffer register (refer to Figure 3-5).

The function to transfer the data prepared in advance in the buffer register to the output latch when a trigger such

as a timer interrupt occurs, and output the data to an external device is called a real-time output function. A port used

in this way is called a real-time output port (RTP).

Table 3-4 shows the real-time output ports of the µPD784916A.

Table 3-5 shows the trigger sources of RTPs.

Figure 3-5. Configuration of RTP

Buffer register

Output trigger

Port output latch

Port

Table 3-4. Bit Configuration of RTP

RTP

RTP0

RTP8

Alternate

Function

Port 0

Port 8

Number of Bits of

Real-Time Output

Data

4 bits x 2 channels or

8 bits x 1 channel

1 bit x 1 channel and

2 bits x 1 channel

Number of Bits That

Can Be Specified as

RTP

4-bit units

Remark

-

1-bit units

Pseudo VSYNC output: 1 channel (RTP80)

Head amplifier switch: 1 channel (RTP82)

Chrominance rotation signal output: 1

channel (RTP83)

Table 3-5. Trigger Sources of RTP

RTP

RTP0

RTP8

Trigger Source

Higher 4 bits

Lower 4 bits

All 8 bits

Bit 0

Bits 2 and 3

INTCR00

INTCR01

INTCR02

INTCR13

INTCR50

INTCR0

Remark

Note 1

Note 2

Notes 1. Select one of the four trigger sources.

2. When the real-time output port mode is set by the port mode control register 8 (PMC8), the HASW and

ROT-C signals that are set by the head amplifier switch output control register (HAPC) are directly output.

The HASW and ROT-C signals are synchronized with HSW output (TM0-CR00 coincidence signal).

However, the set signal is output immediately when the HAPC register is rewritten.

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