ml670100 Oki Semiconductor, ml670100 Datasheet - Page 165

• Manufacturer Part Number: ml670100
• Description: Ml670100 Is A High-performance 32-bit Microcontroller
• Manufacturer: Oki Semiconductor

11.2
11.2.1
The Bus Width Control Register (BWCON) is an 8-bit read/write register that controls the
external data bus width for each bank.
After a system reset, this register contains a value that depends on the DBSEL input level
during the reset. "H" level (V
0x0E.
Bit Descriptions
BWBn (n=0-3)
The BWBn bit specifies the external data bus width for bank n. Setting it to "1" selects 16 bits;
resetting it to "0," 8 bits. (Note that this setting does not affect access to bank 0 internal devices
via the 32-bit core bus and 16-bit peripheral bus.)
After a system reset, the BWB0 bit reflects the DBSEL input level during the reset. "H" level
8 bits.
Control Registers
Bus Width Control Register (BWCON)
(V
7
DD
0
) input (BWB0 = "1") sets the width to 16 bits; "L" level (GND) input (BWB0 = "0"), to
6
0
Figure 11.3 : Bus Width Control Register (BWCON)
A "0” indicates a reserved bit. Always write "0” to it.
Writing "1” produces unreliable operation.
5
0
4
0
DD
) input sets the register to 0x0F; "L" level (GND) input, to
BWB3
3
BWB2
2
BWB1
1
BWB0
BWBn
(n=0 -3)
0
1
0
Bank n data bus width
8 bits
16 bits
11-9