4518 datasheet(70/160 Pages) RENESAS

70 / 160 page

Rev.3.01

2005.06.15

page 70 of 157

REJ03B0008-0301

4518 Group

ROM ORDERING METHOD

1.Mask ROM Order Confirmation Form✽

2.Mark Specification Form✽

3.Data to be written to ROM, in EPROM form (three identical cop-

ies) or one floppy disk.

✽ For the mask ROM confirmation and the mark specifications, re-

fer to the “Renesas Technology Corp.” Homepage

(http://www.renesas.com/en/rom).

(7) Clock control register MR

through register A with the TMRA instruction. In addition, the TAMR

instruction can be used to transfer the contents of register MR to

Table 22 Clock control registers

Note: “R” represents read enabled, and “W” represents write enabled.

MR3

Clock control register MR

Operation mode

Through mode (frequency not divided)

Frequency divided by 2 mode

Frequency divided by 4 mode

Frequency divided by 8 mode

Main clock (f(XIN)) oscillation enabled

Main clock (f(XIN)) oscillation stop

Main clock (f(XIN))

Main clock (f(RING))

at reset : 11112

at RAM back-up : 11112

MR3

R/W

TAMR/

TMRA

Main clock f(XIN) oscillation circuit control bit

System clock oscillation source selection bit

Operation mode selection bits

MR2

MR1

MR0

MR2

On-chip oscillator (f(RING)) oscillation enabled

On-chip oscillator (f(RING)) oscillation stop

On-chip oscillator (f(RING)) control bit

Clock control register RG

TRGA

at RAM back-up : 02

at reset : 02

RG0

(8) Clock control register RG

tents of this register through register A with the TRGA instruction.

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