Toshiba TLCS-900/L1 Series Manual page 30

(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 to 7FFFFFH
2. Data ROM: Address 800000H to BFFFFFH
3. Program ROM: Address C00000H to 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.
91C824-28
TMP91C824
2008-02-20