參數(shù)資料
型號(hào)： μPD753012A
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(yè)數(shù)： 15/80頁(yè)
文件大?。?/td> 433K
代理商： ΜPD753012A
15
m
PD753012A, 753016A, 753017A
4. SWITCHING FUNCTION BETWEEN Mk I MODE AND Mk II MODE
4.1 Differences between Mk I Mode and Mk II Mode
The CPU of
m
PD753017A has the following two modes: Mk I and Mk II, either of which can be selected. The
mode can be switched by the bit 3 of the stack bank select register (SBS).
Mk I mode:
Upward compatible with
m
PD75316B.
Can be used in the 75XL CPU with a ROM capacity of up to 16K bytes.
Incompatible with
m
PD75316B.
Can be used in all the 75XL CPU’s including those products whose ROM capacity is more
than 16K bytes.
Mk II mode:
Table 4-1. Differences between Mk I Mode and Mk II Mode
Mk I Mode
Mk II Mode
Program memory (bytes)
m
PD753012A : 12288
m
PD753016A, 753017A : 16384
m
PD753012A : 12288
m
PD753016A : 16384
m
PD753017A : 24576
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 exceeding 16 Kbytes for the 75X and
75XL series. Therefore, this mode is effective for enhancing software compatibility
with products exceeding 16 Kbytes.
When the Mk II mode is selected, the number of stack bytes used during
execution of subroutine call instructions increases by one byte per stack
compared to the Mk I mode. When the CALL !addr and CALLF !faddr instructions
are used, the machine cycle becomes longer by one machine cycle. Therefore,
use the Mk I mode if the RAM efficiency and processing performance are more
important than software compatibility.
相關(guān)PDF資料
PDF描述
μPD753016A 4 Bit Single Chip Microcontrollers(4 位單片微控制器)
μPD753017A 4 Bit Single Chip Microcontrollers(4 位單片微控制器)
μPD753012 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD753016 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD753017 8 Bit Single Chip Microcontrollers(8位單片微控制器)
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