Renesas SH7641 Informações Técnicas descarregar pdf (Página 111)

3.22 Download Function to the Flash Memory Area

The E10A emulator enables downloading to the flash memory area. This function requires a

program for writing the flash memory (hereinafter referred to as a write module), a program

for erasing the flash memory (hereinafter referred to as an erase module), and the RAM area

for downloading and executing these modules.

Note: The write/erase module must be prepared by users.

 Interface with write/erase module and E10A emulator firmware

The write/erase module is branched from the E10A emulator firmware. To branch from

the E10A emulator firmware to the write/erase module or to return from the write/erase

module to the E10A emulator firmware, the following conditions must be observed:

• Describe all the write/erase modules with the assembly language.

• Guarantee all the general/control register values before and after calling the write/erase

module.

• Return the write/erase module to the calling source after processing.

The module interface must be as follows to pass correctly the information that is required

for flash memory accessing.

Table 3.6 Module Interface

Module Name Argument Return Value

Write module R4(L): Write address

R7(L): Verify option

0 = no verify,

1 = verify

R5(L): Access size

0x4220 = byte,

0x5720 = word,

0x4C20 = longword

R6(L): Write data

R0(L): End code

Normal end = 0,

Abnormal end = other than 0,

Verify error = BT

Erase module R4(L): Access size

0x4220 = byte,

0x5720 = word,

0x4C20 = longword

None

Note: The (L) means the longword size.

Note: Write module:

The write data for the access size is set to the R6 register. When the access size is

word or byte, 0 is set to the upper bit of the R6 register.

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