H8SSLASH2218 datasheet(621/750 Pages) RENESAS

621 / 750 page

Section 17 Flash Memory (F-ZTAT Version)

Rev.6.00 Jun. 03, 2008 Page 573 of 698

REJ09B0074-0600

3. Set the frequency for transmission from the host as a numeric value in units of MHz

× 100 (ex:

16.00 MHz

→ H'0640, 24.00 MHz → H'0960).

4. In boot mode, the 4-kbyte on-chip RAM area H'FFE000 to H'FFEFBF is used by the boot

program. The programming control program is transferred from the host stored in the 8-kbyte

area H'FFC000 to H'FFDFFF in the HD64F2218, HD64F2218U, HD64F2212, and

HD64F2212U and the 4-kbyte area H'FFD000 to H'FFDFFF in the HD64F2211 and

HD64F2211U. The boot program area cannot be used until program execution switches to the

programming control program. Also note that the boot program remains in RAM even after

control passes to the programming control program.

5. When a branch is made to the programming control program, the USB remains connected and

can be used immediately for transmission/reception of write data or verify data between the

programming control program and the host. The contents of CPU general registers are

undefined after a branch to the programming control program. Note, in particular, that since the

stack pointer is used implicitly in subroutine calls ad the like, it should be initialized at the start

of the programming control program.

6. Boot mode is by means of a reset. Drive the reset pin low, wait for the elapse of at least 20

states, then set the FWE pin and mode pins to release the reset.* Boot mode is also exited in

the event of a WDT overflow reset.

7. Do not change the input level of the mode pins while in boot mode. In the input level of a

mode pin is changed (from low to high) during a reset, the states of ports with a dual function

as address output s, and bus control output signals (

AS, RD, WR), will change due to switching

of the operating mode. Either make pin settings so that these pins do not become output signal

pins during a reset, or take precautions to prevent collisions with external signals.

8. Interrupt cannot be used during flash memory programming or erasing.

Note: * FWE pin and mode pin input must satisfy the mode programming set up time (tMDS =

200 ns) when a reset is released.

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