Toshiba TLCS-900/L1 Series Manual page 83

(1) Memory start address registers
Figure 3.6.1 shows the memory start address registers. The memory start address
registers MSAR0 to MSAR3 set the start addresses for the CS0 to CS3 areas. Set the
upper 8 bits (A23 to A16) of the start address in <S23:16>. The lower 16 bits of the
start address (A15 to A0) are permanently set to 0. Accordingly, the start address can
only be set in 64-Kbyte increments, starting from 000000H. Figure 3.6.2 shows the
relationship between the start address and the start address register value.
Memory Start Address Registers (for areas CS0 to CS3)
MSAR0 MSAR1
Bit symbol
(00C8H) (00CAH)
Read/Write
MSAR2 MSAR3
After reset
(00CCH) (00CEH)
Function
Address
000000H
64 Kbytes
FFFFFFH
Figure 3.6.2 Relationship between Start Address and Start Address Register Value
7 6 5
S23 S22 S21
1 1 1
Determines A23 to A16 of start address.
Figure 3.6.1 Memory Start Address Register
Start address Value in start address register (MSAR0 to MSAR3)
000000H ...................... 00H
010000H ...................... 01H
020000H ...................... 02H
030000H ...................... 03H
040000H ...................... 04H
050000H ...................... 05H
060000H ...................... 06H
to
FF0000H ...................... FFH
91C824-81
4 3
S20 S19 S18
R/W
1 1
Sets start addresses for areas CS0 to CS3.
to
TMP91C824
2 1 0
S17 S16
1 1 1
2008-02-20