6V7 datasheet(192/298 Pages) RENESAS

192 / 298 page

Rev.1.00

May 18, 2004

page 192 of 296

M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP

b6 b5 b4 b3 b2 b1 b0

BIt symbol

BIt name

Function

R W

When f(XIN)=16MHz, set "001112"

When f(XIN)=10MHz, set "001002"

Please set up the same value as VCO00.

Must always be set to "0"

Internal oscillation control register 1 (Note)

Symbol

Address

When reset

DIV0

0280

0016

Symbol

Address

When reset

DIV1

0281

0016

Symbol

Address

When reset

VCO

0282

0016

DIV00

DIV01

DIV02

DIV03

DIV04

DIV05

Reserved bit

b6 b5 b4 b3 b2 b1 b0

BIt symbol

BIt name

Function

R W

Internal oscillation frequency

=(N+1)/2MHz

N : Values that can be set by DIV16 to DIV10

Set N as shown below:

N="3B16"–"4F16" when VCO01="0"

N="2716"–"3B16" when VCO01="1"

Ex. Set 2716 at 20MHz

Set 4F16 at 40MHz

Must always be set to "0"

Internal oscillation control register 2 (Note)

DIV10

DIV11

DIV12

DIV13

DIV14

DIV15

DIV16

Reserved bit

b6 b5 b4 b3 b2 b1 b0

BIt symbol

BIt name

Function

R W

0 : OFF

1 : ON

0 : Selects oscillator for 30 to 40 MHz

1 : Selects oscillator for 20 to 30 MHz

Must be fixed to (b3, b2)=(0, 0)

Must always be set to "0"

Internal oscillation control register 3 (Note)

VCO00

VCO01

VCO02

VCO03

Reserved bit

Internal oscillation frequency

select bit

Reference clock divide bit

Internal oscillation adjustment

bit

Internal oscillator operating bit

Internal oscillator control bit

Oscillation characteristic switch

bits

Note : Since there is a possibility that jitter may occer, do not access these registers during display.

Figure 2.16.18 Internal oscillation control register i (i=1 to 3)

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