HD64F3039F18 Datasheet, PDF (499/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 15 ROM
Notes on use of the RAM emulation function
(1) Notes on flash write enable (FWE) high/low
Care is necessary to prevent erroneous programming/erasing at FWE = high/low, the same as
in the on-board programming mode. To prevent erroneous programming and erasing due to
program runaway, etc., during FWE application, in particular, the watchdog timer should be
set when the P, or E bit is set to 1 in FLMCR, even while the emulation function is being used.
For more information, see section 15.9, Notes on Flash Memory Programming/Erasing.
(2) NMI input disable conditions
When the P and E bits in FLMCR are set, NMI input is disabled, the same as normal
program/erase even when using the emulation function.
NMI input is cleared when the P and E bits are reset (including watchdog timer reset), in the
standby mode, when a high level is not applied to FWE, and when the SWE bit in FLMCR is 0
in state in which a high level is input to FWE.
15.8 Flash Memory PROM Mode
15.8.1 PROM Mode Setting
This LSI has a PROM mode, besides an on-board programming mode, as a flash memory
program/erase mode. In the PROM mode, a program can be freely written to the on-chip ROM
using a PROM programmer that supports the Renesas Technology 128 kbytes flash memory on-
chip microcomputer device type.
For notes on PROM mode use, see sections 15.8.9, Notes on Memory Programming and 15.9,
Notes on Flash Memory Programming/Erasing.
Rev.3.00 Mar. 26, 2007 Page 475 of 682
REJ09B0353-0300