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參數(shù)資料
| 型號： | UPD750004GBA |
| 廠商： | NEC Corp. |
| 英文描述： | 4 BIT SINGLE-CHIP MICROCONTROLLER |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 14/84頁 |
| 文件大小： | 719K |
| 代理商： | UPD750004GBA |
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14
μ
PD750004, 750006, 750008, 750004(A), 750006(A), 750008(A)
4.
Mk
Ι
MODE/Mk
ΙΙ
MODE SWITCH FUNCTION
4.1 DIFFERENCES BETWEEN Mk
Ι
MODE AND Mk
ΙΙ
MODE
The CPU of the
μ
PD750008 has two modes (Mk
Ι
mode and Mk
ΙΙ
mode) and which mode is used is selectable.
Bit 3 of the stack bank selection register (SBS) determines the mode.
Mk
Ι
mode:
This mode has the upward compatibility with the
μ
PD75008.
It can be used in the 75XL CPUs having a ROM of up to 16 KB.
This mode is not compatible with the
μ
PD75008.
It can be used in all 75XL CPUs, including those having a ROM of 16 KB or more.
Mk
ΙΙ
mode:
Table 4-1 shows the differences between Mk
Ι
mode and Mk
ΙΙ
mode.
Table 4-1 Differences between Mk
Ι
Mode and Mk
ΙΙ
Mode
Caution Mk
ΙΙ
mode can be used to support a program area larger than 16K bytes in the 75X series or 75XL
series. This mode enhances a software compatibility with products whose program area is larger
than 16K bytes. In Mk
ΙΙ
mode, one more stack byte is required for execution of subroutine call
instructions per stack compared with Mk
Ι
mode. When a CALL !addr or CALLF !faddr instruction
is executed, it takes one more machine cycle. Therefore, Mk
Ι
mode should be used for applications
for which RAM efficiency or processing capabilities is more critical than a software compatibility.
Number of stack bytes in a
subroutine instruction
BRA !addr1 instruction
CALLA !addr1 instruction
CALL !addr instruction
CALLF !faddr instruction
2 bytes
None
3 machine cycles
2 machine cycles
3 bytes
Available
4 machine cycles
3 machine cycles
Mk
Ι
mode
Mk
ΙΙ
mode
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