參數(shù)資料
型號: UPD754304GS-XXX
廠商: NEC Corp.
英文描述: 4-Bit Microcontroller
中文描述: 4位微控制器
文件頁數(shù): 15/74頁
文件大?。?/td> 316K
代理商: UPD754304GS-XXX
μ
PD754302, 754304, 754302(A), 754304(A)
15
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 Since 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.
SBS3
SBS2
SBS1
SBS0
3
2
1
0
Symbol
SBS
Address
F84H
0
0
0
1
0
Memory bank 0
Other than above setting prohibited
0 must be set in the bit 2 position.
Stack area specification
Mk II mode
Mk I mode
Mode switching specification
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