SH7055SF datasheet(13/1002 Pages) RENESAS

13 / 1002 page

Rev.2.0, 07/03, page xiii of xxxviii

Item

Page Revisions (See Manual for Details)

22.1 Features

• Programming/erasing time

• Number of programming

736

Description amended

• Programming/erasing time

The flash memory programming time is t

P ms (typ) in

128-byte simultaneous programming and t

P/128ms per

byte. The erasing time is t

E s (typ) per block.

• Number of programming

The number of flash memory programming can be up

to N

WEC times.

22.4.3 Programming/Erasing

Interface Parameters

(2) Programming/Erasing

Initialization

758

Description added

Line 13

The general registers R8 to R15 are stored. The general

registers R0 to R7 can be used without being stored.

22.5.3

User Boot Mode

(1) User Boot Mode Initiation

782

Description added

Line 3

When the reset start is executed in user boot mode, the

check routine for flash-memory related registers runs.

While the check routine is running, the RAM area about

1.2 kbytes from H'FFFF6800 is used by the routine and 4

bytes from H'FFFFDFFC is used as a stack area. NMI

and all other interrupts cannot be accepted. Neither can

the AUD be used in this period. This period is

approximately 100

µs while operating at an internal

frequency of 40 MHz.

22.7

Flash Memory Emulation

in RAM

791

Note: Description added

Note: Setting the RAMS bit to 1 puts all the blocks in flash

memory in the programming/erasing-protected

state regardless of the values of the RAM2 to

RAM0 bits (emulation protection). Clear the RAMS

bit to 0 before actual programming or erasure.

RAM emulation can be performed when the user

boot MAT is selected. However,

programming/erasing user boot MAT can be

performed only in boot mode or program mode.

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