H8SSLASH2225 datasheet(829/1071 Pages) RENESAS

829 / 1071 page

Section 20 Flash Memory (F-ZTAT Version)

Rev. 5.00 Aug 08, 2006 page 743 of 982

REJ09B0054-0500

The FLMCR1, FLMCR2, EBR1, and EBR2 settings are retained, however program mode or erase

mode is aborted at the point at which the error occurred. Program mode or erase mode cannot be

re-entered by re-setting the P1 or E1 bit. However, PV1 and EV1 bit setting is enabled, and a

transition can be made to verify mode. Error protection can be cleared only by a reset or in

hardware standby.

20.10 Interrupt Handling When Programming/Erasing Flash Memory

All interrupts, including NMI input, are disabled when flash memory is being programmed or

erased (when the P1 or E1 bit is set in FLMCR1), and while the boot program is executing in boot

mode*1, to give priority to the program or erase operation. There are three reasons for this:

1. Interrupt during programming or erasing might cause a violation of the programming or

erasing algorithm, with the result that normal operation could not be assured.

2. In the interrupt exception handling sequence during programming or erasing, the vector would

not be read correctly*2, possibly resulting in CPU runaway.

3. If an interrupt occurred during boot program execution, it would not be possible to execute the

normal boot mode sequence.

Notes: 1. Interrupt requests must be disabled inside and outside the CPU until the programming

control program has completed programming.

2. The vector may not be read correctly in this case for the following two reasons:

• If flash memory is read while being programmed or erased (while the P1 or E1 bit is

set in FLMCR1), correct read data will not be obtained (undetermined values will be

returned).

• If the interrupt entry in the vector table has not been programmed yet, interrupt

exception handling will not be executed correctly.

20.11 Programmer Mode

In programmer mode, a PROM programmer can be used to perform programming/erasing via a

socket adapter, just as for a discrete flash memory. Use a PROM programmer which supports the

Renesas Technology 512-kbyte, 256-kbyte, or 128-kbyte flash memory on-chip microcomputer

device type. It requires the 12-MHz input clock.

The socket adapter pin correspondence diagram is shown in figure 20.13.

H8S/2225 数据表(PDF) 829 Page - Renesas Technology Corp