參數(shù)資料
型號: μPD754264
廠商: NEC Corp.
英文描述: 4 Bit RISC Microcontrollers(4 位單片微控制器)
中文描述: 4位RISC微控制器(4位單片微控制器)
文件頁數(shù): 12/68頁
文件大?。?/td> 320K
代理商: ΜPD754264
12
μ
PD754264
4.2
Setting Method of Stack Bank Select Register (SBS)
Switching between the Mk I mode and Mk II mode can be done by the SBS. Figure 4-1 shows the format.
The SBS is set by a 4-bit memory manipulation instruction.
When using the Mk I mode, the SBS must be initialized to 1000B at the beginning of a program. When using the
Mk II mode, it must be initialized to 0000B.
Figure 4-1. Stack Bank Select Register Format
Caution
Because SBS. 3 is set to “1” after a RESET signal is generated, the CPU operates in the Mk I mode.
When executing an instruction in the Mk II mode, set SBS. 3 to “0” to select the Mk II mode.
Address
Stack area specification
Symbol
SBS
F84H
SBS3
SBS2 SBS1
SBS0
3
2
1
0
Memory bank 0
Mk II mode
Mk I mode
Other than above setting prohibited
Mode switching specification
0 must be set in the bit 2 position
0
0
1
0
0
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