參數(shù)資料
型號: μPD75P70076
廠商: NEC Corp.
英文描述: 4 Bit Single Chip Microcontrollers(4位單片微控制器)
中文描述: 4位單片微控制器(4位單片微控制器)
文件頁數(shù): 14/62頁
文件大?。?/td> 290K
代理商: ΜPD75P70076
m
PD75P0076
14
4.2 Setting of Stack Bank Selection (SBS) Register
Use the stack bank selection register to switch between the Mk I mode and the Mk II mode. Figure 4-1 shows the format
for doing this.
The stack bank selection register is set using a 4-bit memory manipulation instruction. When using the Mk I mode, be
sure to initialize the stack bank selection register to 100xB
Note
at the beginning of the program. When using the Mk II mode,
be sure to initialize it to 000xB
Note
.
Note
Set the desired value for x.
Figure 4-1. Format of Stack Bank Selection Register
Cautions 1. SBS3 is set to “1” after RESET input, and consequently the CPU operates in the Mk I mode. When
using instructions for the Mk II mode, set SBS3 to “0” to enter the Mk II mode before using the
instructions.
2. When using the Mk II mode, execute a subroutine call instruction and an interrupt instruction after
RESET input and after setting the stack bank selection register.
SBS3
SBS2
SBS1
SBS0
F84H
Address
3
2
1
0
SBS
0
0
1
1
0
1
0
1
Symbol
Stack area specification
Memory bank 0
Memory bank 1
0
Be sure to enter “0” for bit 2.
0
1
Mk II mode
Mk I mode
Mode selection specification
Setting prohibited
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