VR4102 datasheet(250/701 Pages) NEC

250 / 701 page

CHAPTER 10 BCU (BUS CONTROL UNIT)

250

10 Compare the data written to flash memory with the original data.

• If the data matches, perform processing at “11”.

• If the data does not match

Start processing from “1” when rewriting.

If processing is interrupted, start processing from “11”.

11 Reduce the flash memory write voltage (VPP) and end processing after flash memory mode has been

canceled.

12 Clear any error data in the flash memory register.

• If writing again

If the write voltage is too low, start processing from “1”.

In all other cases, start processing from “4”.

• If processing is completed, perform processing at “11”.

10.4.5 LCD Control Interface

(1) Access Size

Available access sizes for accessing the LCD controller interface are 1 byte, 2 bytes, 4 bytes, and 8 bytes.

(2) Data Inversion

When “0” has been set to the BCUCNTREG1’s ISAM/LCD bit and to BCUCNTREG2’s GMODE bit, the VR4102

inverts the bits in the data being read or written via the LCD controller interface.

Table 10-6. Example of Bit Inversion in Data in VR4102 and at DATA [15:0] Pins

Data in VR4102

Data at DATA [15:0] Pins

0x0000

0xFFFF

0xA5A5

0x5A5A

0x1234

0xEDCB

VR4102 Datasheet(PDF) 250 Page - NEC