Toshiba H1 Series, TLCS-900, TMP92CZ26AXBG TMP92CZ26A , 92CZ26A-33

TMP92CZ26A
92CZ26A-33
(4) Runaway provision with SFR protecti on register
(Purpose)
Provision in runaway of program by noise mixing.
W rit e operation t o specified SFR is prohib ited so that prov ision program in r unaway
prevents that it is in the state which is fetch impossibility by stopping of clock,
memory control r eg ister (Memory controller, MMU) is changed.
And error handling in runaway becomes easy by INTP0 interruption.
Specified SFR list
1. Memory controller
B0CSL/H, B1CSL/H, B2CSL/H, B3CSL/H, BECSL/H
MSAR0, MSAR1, MSAR2, MSAR3,
MAMR0, MAMR1, MAM R2, MAMR3, PMEMCR,
MEMCR0, CSTMGCR, WRTM GCR, RDTMGCR0
RDTMGCR1 , BROMCR
2. MMU
LOCALPX/PY/PZ, LOCALLX/LY/LZ,
LOCALRX/RY/RZ, LOCALWX/WY/WZ,
LOCALESX/ESY/ESZ, LOCALEDX/EDY/EDZ,
LOCALOSX/OSY/OSZ, LOCALODX/ODY/ODZ
3. Clock gear
SYSCR0, SYSCR1, SYSCR2, EMCCR0
4. PLL
PLLCR0,PLLCR1
5. PMC
PMCCTL
(Operation explanation)
Execute and release of protection (write operation to specified SFR) becomes
possible by setting up a double k ey to EMCCR1 and EMCCR2 register.
(Double key)
1st-KEY: Succession writes in 5AH at EMCCR 1 and A5H at EMCCR2
2nd-KEY: Suc cession writes in A5H at EMCCR1 and 5AH at EMCCR2
A state of protection can be confirmed by reading EMCCR0<PROTECT>.
By reset, protect ion becomes OFF.
And INTP0 interruption occurs when write operation to specifi ed SFR was executed
with protection on sta te.