TMP91C824
91C824-83
Chip Select/Wait Control Register
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 wait
+
N
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 wait
+
N
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 wait
+
N
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 wait
+
N
110: 4 waits
011: 0 waits
111: 8 waits
Bit Symbol
BEXBUS
BEXW2
BEXW1
BEXW0
Read/Write
0
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 wait
+
N
110: 4 waits
011: 0 waits
111: 8 waits
Chip select output waveform
selection
00 For ROM/SRAM
01
10
11
Don’t care
Master enable bit
0
Enable
1
Disable
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.
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.)
Figure 3.6.5 Chip Select/Wait Control Registers