ml670100 Oki Semiconductor, ml670100 Datasheet - Page 169

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

11.2.5
The Bus Access Control Register (BACON) is an 8-bit read/write register that specifies the
access methods for 16-bit bus access to the SRAM banks (0 and 1). One access method uses two
Byte Select signals; the other two Write Enable signals.
After a system reset, this register contains 0x00. Do not set the BASn bits to different values.
Doing so produces unreliable operation.
SRAM in bank n, switching the nWRE/nWRL, nHB/nWRH, and nLB/XA0 pins between two
different configurations. Setting it to "1" configures the pins as one Write Enable signal and
two Byte Select signals (nWRE, nHB and nLB); resetting it to "0," as two Write Enable signals
and one Byte Select signal (nWRH and nWRL).
Bus Access Control Register (BACON)
Bit Descriptions
BASn (n=0,1)
The Byte Access Specification n (BASn, n=0,1) bit specifies the access method for 16-bit
Set both bits to the same value so that the two banks use the same signals.
7
0
6
0
Figure 11.7 : Bus Access Control Register (BACON)
A "0” indicates a reserved bit. Always write "0” to it.
Writing "1” produces unreliable operation.
5
0
BAS1
4
3
0
2
0
1
0
BAS0
0
BASn
(n=0,1)
0
1
Access methods
Access bank n with
two Write Enable
signals
Access bank n with
two Byte Select signals
11-13