3850 datasheet(64/103 Pages) RENESAS

64 / 103 page

Rev.3.01

2003.06.20

page 62 of 98

3850 Group (Spec.H/A)

(2) Parallel I/O Mode

Parallel I/O mode is the mode which parallel output and input soft-

ware command, address, and data required for the operations

(read, program, erase, etc.) to a built-in flash memory. Use the ex-

clusive external equipment flash programmer which supports the

3850 Group (flash memory version). Refer to each programmer

maker’s handling manual for the details of the usage.

User ROM and Boot ROM Areas

In parallel I/O mode, the user ROM and boot ROM areas shown in

Figure 57 can be rewritten. Both areas of flash memory can be oper-

ated on in the same way.

Program and block erase operations can be performed in the user ROM

area. The user ROM area and its block is shown in Figure 57.

The boot ROM area is 4 Kbytes in size. It is located at addresses

F00016 through FFFF16. Make sure program and block erase opera-

tions are always performed within this address range. (Access to any

location outside this address range is prohibited.)

In the Boot ROM area, an erase block operation is applied to only

one 4 Kbyte block. The boot ROM area has had a standard serial I/O

mode control program stored in it when shipped from the Mitsubishi

factory. Therefore, using the device in standard serial I/O mode, you

do not need to write to the boot ROM area.

3850 Datasheet(PDF) 64 Page - Renesas Technology Corp