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參數(shù)資料
| 型號： | μPD75P3018A |
| 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)： | 13/60頁 |
| 文件大小： | 337K |
| 代理商： | ΜPD75P3018A |
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μPD75P3018A
13
4.SWITCHING FUNCTION BETWEEN M I MODE AND Mk II MODE
Setting a stack bank selection (SBS) register for the
m
PD75P3018A enables the program memory to be switched between
Mk I mode and Mk II mode. This function is applicable when using the
m
PD75P3018A to evaluate the
m
PD753012A,
753016A, or 753017A.
When the SBS bit 3 is set to 1 : sets Mk I mode (supports Mk I mode for
m
PD753012A, 753016A, and 753017A)
When the SBS bit 3 is set to 0 : sets Mk II mode (supports Mk II mode for
m
PD753012A, 753016A, and 753017A)
4.1 Difference between Mk I Mode and Mk II Mode
Table 4-1 lists points of difference between the Mk I mode and the Mk II mode for the
m
PD75P3018A.
Table 4-1. Difference between Mk I Mode and Mk II Mode
Item
Mk I Mode
Mk II Mode
Program counter
PC
13-0
PC
14
is fixed at 0
PC
14-0
Program memory (bytes)
16384
32768
Data memory (bits)
1024 x 4
Stack
Stack bank
Selectable via memory banks 0 to 3
No. of stack bytes
2 bytes
3 bytes
Instruction
BRA !addr1 instruction
Not available
Available
CALLA !addr1 instruction
Instruction
CALL !addr instruction
3 machine cycles
4 machine cycles
execution time CALLF !faddr instruction
2 machine cycles
3 machine cycles
Supported mask ROMs
When set to Mk I mode:
m
PD753012A, 753016A, and 753017A
When set to Mk II mode:
m
PD753012A, 753016A, and 753017A
Caution
The Mk II mode supports a program area exceeding 16 Kbytes for the 75X and 75XL series. Therefore,
this mode is effective for enhancing software compatibility with products that have a program area of
more than 16 Kbytes.
With regard to the number of stack bytes during execution of subroutine call instructions, the usable
area increases by 1 byte per stack compared to the Mk I mode when the Mk II mode is selected.
However, when the CALL !addr and CALLF !faddr instructions are used, the machine cycle becomes
longer by 1 machine cycle. Therefore, if more emphasis is placed on RAM use efficiency and
processing performance than on software compatibility, the Mk I mode should be used.
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