H838532H datasheet(390/508 Pages) RENESAS

390 / 508 page

Section 13 LCD Controller/Driver

Rev. 1.00 May 30, 2008 Page 370 of 484

REJ09B0436-0100

13.2.2

LCD Control Register (LCR)

Bit

Initial value

Read/Write

—

PSW

R/W

ACT

R/W

DISP

R/W

CKS3

R/W

CKS0

R/W

CKS2

R/W

CKS1

R/W

LCR is an 8-bit read/write register which performs LCD drive power supply on/off control and

display data control, and selects the frame frequency.

LCR is initialized to H'80 upon reset.

Bit 7: Reserved bit

Bit 7 is reserved; it is always read as 1 and cannot be modified.

Bit 6: LCD drive power supply on/off control (PSW)

Bit 6 can be used to turn the LCD drive power supply off when LCD display is not required in a

power-down mode, or when an external power supply is used. When the ACT bit is cleared to 0,

or in standby mode, the LCD drive power supply is turned off regardless of the setting of this bit.

Bit 6

PSW

Description

LCD drive power supply off

(initial value)

LCD drive power supply on

Bit 5: Display function activate (ACT)

Bit 5 specifies whether or not the LCD controller/driver is used. Clearing this bit to 0 halts

operation of the LCD controller/driver. The LCD drive power supply is also turned off, regardless

of the setting of the PSW bit. However, register contents are retained.

Bit 5

ACT

Description

LCD controller/driver operation halted

(initial value)

LCD controller/driver operates

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