M37207MF datasheet(51/122 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

The display position in the vertical direction is determined by count-

ing the horizontal sync signal (HSYNC). At this time, when VSYNC and

HSYNC are positive polarity (negative polarity), it starts to count the

rising edge (falling edge) of HSYNC signal from after fixed cycle of

rising edge (falling edge) of VSYNC signal. So interval from rising edge

(falling edge) of VSYNC signal to rising edge (falling edge) of HSYNC

signal needs enough time (2 machine cycles or more) for avoiding

jitter. The polarity of HSYNC and VSYNC signals can select with the

CRT port control register (address 00EC16).

Fig. 48. Vertical Position Register i

Fig. 47. Supplement Explanation for Display Position

When bits 0 and 1 of the CRT port control register

(address 00EC16) are set to “1” (negative polarity)

VSYNC signal input

VSYNC control

signal in

microcomputer

0.125 to 0.50 [

µs]

( at f(XIN) = 8MHz)

Period of counting

HSYNC signal

(Note 2)

HSYNC

signal input

Not count

12345

Notes 1 : The vertical position is determined by counting falling edge of HSYNC

signal after rising edge of V SYNC control signal in the microcomputer.

2 : Do not generate falling edge of HSYNC signal near rising edge of

VSYNC control signal in microcomputer to avoid jitter.

8 machine cycles

or more

8 machine cycles

or more

b7 b6 b5 b4 b3 b2 b1 b0

Vertical position register i (CVi) (i = 1 to 3) [Addresses 00E116 to 00E316]

Name

Functions

After reset

R W

Vertical Position Register i

Vertical display start positions

128 steps (0016 to 7F16)

Indeterminate

(CVi : CVi0 to CVi6)

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

R—

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