32186 datasheet(160/1032 Pages) RENESAS

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INTERNAL MEMORY

6-18

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

6.5 Registers Associated with Internal Flash Memory

Flash Control Register 2 (FCNT2)

<Address: H’0080 01E3>

Bit Name

Function

8–10

No function assigned. Fix to "0."

FLOCKS

0: Memory area read mode

R(Note 1)

Lock bit read mode select bit

1: Register read mode

12–14

No function assigned. Fix to "0."

FPROT

0: Protection by lock bit effective

R(Note 1)

Lock bit protect control bit

1: Protection by lock bit invalidated

Note 1: It can be accessed for write only during the Flash E/W entry mode (FENTRY bit = "1").

(1) FLOCKS (Lock Bit Read Mode Select) bit (Bit 11)

The FLOCKS bit is used to select a method for reading out the lock bit status. When the FLOCKS bit = "0,"

the internal flash memory is placed in memory area read mode, so that it is possible to inspect the lock bit

status by issuing command data H’7171 to any address of the flash memory and then reading the last even

address of the target block. When the FLOCKS bit = "1," the internal flash memory is placed in register read

mode, so that it is possible to inspect the lock bit status by first issuing command data H’7171 and H’D0D0

to any address of the target block in succession and then, when the FBUSY bit is set to "1," by reading the

FLOCKST bit in Flash Control Register 4.

The FLOCKS bit can only be accessed for write when the FENTRY bit = "1."

If one of the following operations is attempted, the FLOCKS bit is cleared to "0."

1) Writing "0" to the FLOCKS bit

2) Entering a "L" level signal to the FP pin

3) Clearing the FENTRY bit to "0"

4) Entering a "L" level signal to the RESET# pin

(2) FPROT (Lock Bit Protect Control) bit (Bit 15)

The FPROT bit controls invalidation of the internal flash memory protection by a lock bit (protection against

programming/erase operation). Protection of the internal flash memory is invalidated by setting the FPROT

bit to "1," so that any blocks protected by a lock bit can now be programmed or erased.

To set the FPROT bit to "1," write "0" and then "1" to the FPROT bit in succession while the FENTRY bit =

"1." To clear the FPROT bit to "0," write "0" to the FPROT bit.

If one of the following operations is attempted, the FPROT bit is cleared to "0."

1) Writing "0" to the FPROT bit

2) Entering a "L" level signal to the FP pin

3) Clearing the FENTRY bit to "0"

4) Entering a "L" level signal to the RESET# pin

11121314

b15

FLOCKS

FPROT

000

0000

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