M37225M6_15 datasheet(25/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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25 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 23 of 124

REJ03B0136-0100Z

Fig. 8.3.6 Interrupt Input Polarity Register

b7 b6 b5 b4 b3 b2 b1 b0

Interrupt input polarity register (IP) [Address 00CD16]

b

Name

Function

After reset R W

Interrupt Input Polarity Register

0

INT1 polarity

switch bit (POL1)

2

3

4

5

0 : Positive polarity

1 : Negative polarity

6, 7

0

R W

0

R W

0

R W

INT2 polarity

switch bit (POL2)

INT3 polarity

switch bit (POL3)

Fix these bits to “0.”

0

W

R

0

W

R

0, 1 OSD clock

selection bits

(OCG0, OCG1)

0

R W

Since the main clock is used as the

clock for OSD, the oscillation

frequency is limited. Because of

this, the character size in width

(horizonal) direction is also limited.

In this case, pins OSC1 and OSC2

are also used as input ports P33

and P34 respectively.

The clock for OSD is supplied by connecting the

following across the pins OSC1 and OSC2.

However, it is not corresponding to the bi-scan

mode.

• a ceramic resonator only for OSD and a

feedback resistor

• a quartz-crystal oscillator only for OSD and a

feedback resistor

b1

The clock for OSD is supplied by connecting RC

or LC across the pins OSC1 and OSC2. However,

it is not corresponding to the bi-scan mode.

Function

00

b0

OSD

oscillation

frequency =

f(XIN)

0

1

11

The clock for OSD is supplied by connecting LC

across the pins OSC1 and OSC2. In the bi-scan

mode, be sure to set this.

Fix this bit to “0.”

0 : Positive polarity

1 : Negative polarity

0 : Positive polarity

1 : Negative polarity

0

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