Toshiba TMP91C815F Data Book page 31

(5) Runaway provision with ROM protection register
(Purpose)
Provision in runaway of program by noise mixing.
(Operation explanation)
When write operation was executed for external three kinds of ROM by runaway of program,
INTP1 is occurred and detects runaway function.
Three kinds of ROM is fixed as for Flash-ROM(Option-Program ROM), Data-ROM,
Program-ROM are as follows on the logical address memory map.
1. Flash-ROM : Address 400000H-7FFFFFH
2. Data-ROM : Address 800000H-BFFFFFH
3. Program-ROM : Address C00000H-FFFFFFH
For these address, admission / prohibition of detection of write operation sets it up with
EMCCR3<ENFROM,ENDROM,ENPROM>. And INTP1 interruption occurred within which
ROM can confirm each with EMCCR3<FFLAG,DFLAG,PFLAG>. This flag is cleared when write
in "0".
91C815-28
TMP91C815