TMP91C025FG Datasheet, PDF (82/260 Pages) Toshiba Semiconductor – Original CMOS 16-Bit Microcontroller

TMP91C025
(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)
7
6
5
4
3
2
1
0
MSAR0 MSAR1 _{Bit symbol}
S23
S22
S21
S20
S19
S18
S17
S16
(00C8H) (00CAH) _Read/Write
R/W
MSAR2 MSAR3 _{After reset}
1
1
1
1
1
1
1
1
(00CCH) (00CEH) _Function
Determines A23 to A16 of start address.
Sets start addresses for areas CS0 to CS3.
Figure 3.6.1 Memory Start Address Register
Address
000000H
64 Kbytes
FFFFFFH
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
to
FF0000H ...................... FFH
Figure 3.6.2 Relationship between Start Address and Start Address Register Value
91C025-80
2007-02-28