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R01UH0823EJ0100 Rev.1.00 Page 1674 of 1823

Jul 31, 2019

RX23W Group 50. Flash Memory (FLASH)

50.4.15 Flash Write Buffer n Register (FWBn) (n = 0 to 3)

This register is used to set the data for programming the ROM, E2 DataFlash, or extra area. The data can be written in

ROM P/E mode or E2 DataFlash P/E mode.

This register is initialized by a reset or setting the FRESETR.FRESET bit to 1. Data cannot be written to this register

while the FRESETR.FRESET bit is 1.

The read value of this register is undefined while executing a software command set by the FCR register or the FEXCR

When programming the extra area, set the 4-byte data for programming in registers FWB0 and FWB1.

When programming the ROM, set the 8-byte data for programming in registers FWB0 to FWB3.

Figure 50.3 shows the

relationship between the addresses indicated by registers FSARH and FSARL and the data set in the FWBn register.

Figure 50.3 FWBn Register Setting Values and Data Allocation in the ROM

Address(es): FLASH.FWB0 007F C130h, FLASH.FWB1 007F C138h, FLASH.FWB2 007F C140h, FLASH.FWB3 007F C144h

b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

Value after reset:

0000000000000000

When programming the E2 DataFlash, set the data for programming in the lower 8 bits in the FWB0 register.

ROM

01h

Address 1 23h

Address 2 45h

Address 3 67h

Address 4 89h

Address 5 ABh

Address 6 CDh

Address 7 EFh

Registers

FWB0

2301h

FWB1

6745h

FWB2

AB89h

FWB3

EFCDh

FSARH and FSARL + Address 0

Renesas RX Series User Manual

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