32182 datasheet(143/755 Pages) RENESAS

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6-8

INTERNAL MEMORY

32182 Group User’s Manual (Rev.1.0)

6.4 Registers Associated with the Internal Flash Memory

6.4.4 Flash Control Registers

Flash Control Register 1 (FCNT1)

<Address: H’0080 01E2>

123456

FEMMOD

FENTRY

Bit Name

Function

0–2

No function assigned. Fix to "0".

FENTRY

0: Normal read

Flash E/W enable mode entry bit

1: Program/erase enable

4–6

No function assigned. Fix to "0".

FEMMOD

0: Normal mode

Virtual flash emulation mode bit

1: Virtual flash emulation mode

Flash Control Register 1 (FCNT1) consists of the following two bits to control the internal flash memory.

(1) FENTRY (Flash Mode Entry) bit (Bit 3)

The FENTRY bit controls entry to flash E/W enable mode. Flash E/W enable mode can only be entered when

FENTRY = "1".

To set the FENTRY bit to "1", write "0" and then "1" to the FENTRY bit in succession while the FP pin = "high". To

clear the FENTRY bit, check to see that the FSTAT1 register FSTAT bit = "1" (ready) and then write "0" to the

FENTRY bit.

Note that the following operations cannot be performed while programming or erasing the internal flash

memory (FSTAT1 register FSTAT bit = "0" (busy)). If one of these operations is attempted, the FENTRY bit

is cleared to "0" in hardware.

1) Writing "0" to the FENTRY bit

2) Entering a low-level signal to the FP pin

3) Entering a low-level signal to the RESET# pin

When running a program resident in the internal flash memory while the FENTRY bit = "0", the EI vector entry

is located at the address H’0000 0080 of the internal flash memory. When running the flash write/erase

program in the RAM while the FENTRY bit = "1", the EI vector entry is located at the address H’0080 4000 of

the RAM, allowing the flash programming/erase operation to be controlled using interrupts.

Table 6.4.1 Changes of the EI Vector Entry by FENTRY

FENTRY

EI Vector Entry

Address

Internal flash memory area

H'0000 0080

Internal RAM area

H'0080 4000

(2) FEMMOD (Virtual Flash Emulation Mode) bit (Bit 7)

The FEMMOD bit controls entry to virtual flash emulation mode. Virtual flash emulation mode is entered by

setting the FEMMOD bit to "1" while the FENTRY bit = "0". (For details, see Section 6.6, “Virtual Flash

Emulation Function.”)

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