38B5 datasheet(64/356 Pages) RENESAS

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38B5 Group User’s Manual

1-47

HARDWARE

FUNCTIONAL DESCRIPTION

Digit data protect function

The FLD automatic display RAM is provided with a data protect

function that disables the RAM area data to be rewritten as digit

data.

This function can disable data from being written in optional bits in

the RAM area corresponding to P1 to P3. A programming load can

be reduced by protecting an area that requires no change after

data such as digit data is written.

Write digit data beforehand; then set “1” in the corresponding bits.

With this, the setting is completed.

The data protect area becomes the maximum RAM area of P1 and

P3. For example, when bit 0 of P1 is protected in the 16-

timing•ordinary mode, bits 0 of RAM addresses 0FD016 to 0FDF16

can be protected. Likewise, in the 16-timing•gradation display mode,

bits 0 of addresses 0FD016 to 0FDF16 and 0F8016 to 0F8F16 can be

protected. In the 32-timing mode, bits 0 of addresses 0FA016 to

0FBF16 can be protected.

Fig. 48 Structure of FLDRAM write disable register

P1FLDRAM write disable register

(P1FLDRAM : address 0EF216)

FLDRAM corresponding to P10

FLDRAM corresponding to P11

FLDRAM corresponding to P12

FLDRAM corresponding to P13

FLDRAM corresponding to P14

FLDRAM corresponding to P15

FLDRAM corresponding to P16

FLDRAM corresponding to P17

0: Operating normally

1: Write disabled

P3FLDRAM write disable register

(P3FLDRAM : address 0EF316)

FLDRAM corresponding to P30

FLDRAM corresponding to P31

FLDRAM corresponding to P32

FLDRAM corresponding to P33

FLDRAM corresponding to P34

FLDRAM corresponding to P35

FLDRAM corresponding to P36

FLDRAM corresponding to P37

0: Operating normally

1: Write disabled

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