TMP91C824
91C824-85
2008-02-20
7 6 5 4 3 2 1 0
Bit
symbol B0E
B0OM1
B0OM0
B0BUS
B0W2 B0W1 B0W0
Read/Write W
W
After
reset
0 0 0 0 0 0 0
Function 0:
Disable
1: Enable
Chip select output
waveform selection
00: For ROM/SRAM
01:
10: Don’t care
11:
Data bus
width
0: 16 bits
1: 8 bits
Number of waits
000: 2 waits
100: Reserved
001: 1 wait
101: 3 waits
010: (1
+
N) waits 110: 4 waits
011: 0 waits
111: 8 waits
Bit
symbol B1E
B1OM1
B1OM0
B1BUS
B1W2 B1W1 B1W0
Read/Write W
W
After
reset
0 0 0 0 0 0 0
Function 0:
Disable
1: Enable
Chip select output
waveform selection
00: For ROM/SRAM
01:
10: Don’t care
11:
Data bus
width
0: 16 bits
1: 8 bits
Number of waits
000: 2 waits
100: Reserved
001: 1 wait
101: 3 waits
010: (1
+
N) waits 110: 4 waits
011: 0 waits
111: 8 waits
Bit
symbol B2E B2M B2OM1
B2OM0
B2BUS
B2W2 B2W1 B2W0
Read/Write W
After
reset
1 0 0 0 0 0 0 0
Functions 0:
Disable
1: Enable
CS2 area
selection
0: 16-Mbyte
area
1: CS area
Chip select output
waveform selection
00: For ROM/SRAM
01:
10: Don’t care
11:
Data bus
width
0: 16 bits
1: 8 bits
Number of waits
000: 2 waits
100: Reserved
001: 1 wait
101: 3 waits
010: (1
+
N) waits 110: 4 waits
011: 0 waits
111: 8 waits
Bit
symbol B3E
B3OM1
B3OM0
B3BUS
B3W2 B3W1 B3W0
Read/Write W
W
After
reset
0 0 0 0 0 0 0
Functions 0:
Disable
1: Enable
Chip select output
waveform selection
00: For ROM/SRAM
01:
10: Don’t care
11:
Data bus
width
0: 16 bits
1: 8 bits
Number of waits
000: 2 waits
100: Reserved
001: 1 wait
101: 3 waits
010: (1
+
N) waits 110: 4 waits
011: 0 waits
111: 8 waits
Bit
symbol
BEXBUS
BEXW2
BEXW1
BEXW0
Read/Write
W
After
reset
0
0
0
0
Functions
Data
bus
width
0: 16 bits
1: 8 bits
Number of waits
000: 2 waits
100: Reserved
001: 1 wait
101: 3 waits
010: (1
+
N) waits 110: 4 waits
011: 0 waits
111: 8 waits
Figure 3.6.5 Chip Select/Wait Control Registers
B0CS
(00C0H)
Read-
modify-
write
instructions
are
prohibited.
B1CS
(00C1H)
Read-
modify-
write
instructions
are
prohibited.
B2CS
(00C2H)
Read-
modify-
write
instructions
are
prohibited.
B3CS
(00C3H)
Read-
modify-
write
instructions
are
prohibited.
BEXCS
(00C7H)
Read-
modify-
write
instructions
are
prohibited.
Chip select output
waveform selection
00 For ROM/SRAM
01
10
11
Don’t care
Master enable bit
0 Enable
1 Disable
CS2 area selection
0 16-Mbyte
area
1 Specified address area
Data bus width selection
0
16-bit data bus
1
8-bit data bus
Number of address area waits
(See 3.6.2, (3) Wait control.)