參數(shù)資料
型號(hào)： UPD753304
廠商： NEC Corp.
元件分類： 4位微控制器
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 4位單片機(jī)的小型通用紅外遙控器
文件頁數(shù)： 13/56頁
文件大?。?/td> 374K
代理商： UPD753304
13
μ
PD753304
4. SWITCHING FUNCTION BETWEEN Mk I MODE AND Mk II MODE
4.1 Difference between Mk I and Mk II Modes
The CPU of the
μ
PD753304 has the following two modes: Mk I and Mk II, either of which can be selected.
The mode can be switched by bit 3 of the Stack Bank Select register (SBS).
Mk I mode:
Mk II mode: Can be used in all the 75XL CPU’s including those products whose ROM capacity is more than
16K bytes.
Can be used in the 75XL CPU with a ROM capacity of up to 16K bytes.
Table 4-1. Differences between Mk I Mode and Mk II Mode
Mk I mode
Mk II mode
Number of stack bytes
for subroutine instructions
2 bytes
3 bytes
BRA !addr1 instruction
CALLA !addr1 instruction
Not available
Available
CALL !addr instruction
3 machine cycles
4 machine cycles
CALLF !faddr instruction
2 machine cycles
3 machine cycles
Caution The Mk II mode supports a program area which exceeds 16K bytes in the 75X and 75XL
series. This mode enhances the software compatibility with products which have more
than 16K bytes.
When Mk II mode is selected, the number of stack bytes (usable area) in the execution
of a subroutine call instruction increases by 1 per stack compared to Mk I mode.
Furthermore, when a CALL !addr, or CALLF !faddr instruction is used, each instruction
takes another machine cycle. Therefore, when more importance is attached to RAM
utilization or throughput than software compatibility, use the Mk I mode.
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