SH33F2801PSLASH032PR datasheet(37/407 Pages) SINOWEALTH

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SH33F2801

Main Memory (64KB)

FLASH

Backup Memory (64KB)

(Illegal Address, Bus Fault)

0000 0000H

0000 FFFFH

0001 FFFFH

0001 0000H

Physical

Address

0000 0000H

0000 FFFFH

0001 FFFFH

0001 0000H

Logic

Address

FLASH_BACKUP = 1

FLASH_SELECT = 0

OP_ROM [1:0] = 00

Main Memory (64KB)

(Illegal Address, Bus Fault)

FLASH

Backup Memory (64KB)

0000 0000H

0000 FFFFH

0001 FFFFH

0001 0000H

Physical

Address

0000 0000H

0000 FFFFH

0001 FFFFH

0001 0000H

Logic

Address

FLASH_BACKUP = 1

FLASH_SELECT = 1

OP_ROM [1:0] = 00

Figure8-9

Address configuration block diagram after 128/64KB flash block division

(1) When FLASH_SELECT is 0, the logical address of flash area is consistent with the physical address. And after the

system is reset, the content of PC pointer is that: point to the logical address 0000 0000H, physical address 0000 0000H;

(2) When FLASH_SELECT is 1, the logical address of the main memory block will swap with backup memory block in flash

area. At this time:

A. Main memory block logical address = physical address + 0001 0000H;

B. Backup Memory block logical address = physical address - 0001 0000H;

And after the system is reset, the content of PC pointer is that: point to the logical address 0000 0000H, physical address 0001

0000H.

When FLASH_SELECT is 0, the PC pointer points to the main memory block. When the PC pointer exceeds the logical address

range of the main memory block (0000 0000H~0000 FFFFH), it is considered that the program flies and bus fault is generated.

When FLASH_ SELECT is 1, the logical address of the main memory block will swap with backup memory block in flash area.

The PC pointer points to the backup memory block. When the PC pointer exceeds the logical address range of the backup

memory block (0000 0000H~0000 FFFFH), it is considered that the program flies and bus fault is generated.

In a word, when the flash block division function is turned on, the corresponding block can be selected as the area accessed by

PC pointer through FLASH_SELECT. If the PC pointer is beyond the range of the selected block, it is considered that the

program flies and bus fault is generated. However, it should be noted that the non selected flash block can still be read/written

as ROM at this time, but the program is not allowed to run.

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