參數(shù)資料
型號(hào)： M306V8FJFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP116
封裝： 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116
文件頁數(shù)： 40/77頁
文件大小： 2650K
代理商： M306V8FJFP
M306V8FJFP
Rev.1.31
Apr 18, 2005
page 43 of 363
REJ03B0082-0131
Memory Space Expansion Function
The following describes a memory space extension function.
During memory expansion or microprocessor mode, the memory space expansion function allows the
access space to be expanded using the appropriate register bits.
Table 4.11 shows the way of setting memory space expansion function, memory spaces.
Table 4.11. The Way of Setting Memory Space Expansion Function, Memory Space
Memory space expansion function
How to set (PM15 to PM14)
Memory space
1 Mbytes mode
002
1 Mbytes (no expansion)
4 Mbytes mode
112
4 Mbytes
(1) 1 Mbyte Mode
In this mode, the memory space is 1 Mbytes. In 1 Mbyte mode, the external area to be accessed is
______
specified using the CSi (i = 0 to 3) signals (hereafter referred to as the CSi area). Figures 4.13 to 4.14
_____
show the memory mapping and CS area in 1 Mbyte mode.
(2) 4 Mbyte Mode
In this mode, the memory space is 4 Mbytes. Figure 4.12 shows the DBR register. The BSR2 to BSR0
bits in the DBR register select a bank number which is to be accessed to read or write data. Setting the
OFS bit to “1” (with offset) allows the accessed address to be offset by 4000016.
______
In 4 Mbyte mode, the CSi (i=0 to 3) pin functions differently for each area to be accessed.
Addresses 0400016 to 3FFFF16, C000016 to FFFFF16
______
The CSi signal is output from the CSi pin (same operation as 1 Mbyte mode. However the last address
_______
of CS1 area is 3FFFF16)
Addresses 4000016 to BFFFF16
______
The CS0 pin outputs “L”
______
The CS1 to CS3 pins output the value of setting as the BSR2 to BSR0 bits (bank number)
______
Figures 4.15 to 4.16 show the memory mapping and CS area in 4 Mbyte mode. Note that banks 0 to 6 are
______
data-only areas. Locate the program in bank 7 or the CSi area.
Figure 4.12. DBR Register
Data bank register (Note)
Symbol
Address
After reset
DBR
000B16
0016
Bit name
Description
Bit symbol
RW
b7
b6
b5
b4
b3
b2
b1
b0
OFS
Offset bit
0: Not offset
1: Offset
BSR0
Bank selection bits
0 0 0: Bank 0
1 0 0: Bank 4
0 0 1: Bank 1
1 0 1: Bank 5
0 1 0: Bank 2
1 1 0: Bank 6
0 1 1: Bank 3
1 1 1: Bank 7
Nothing is assigned. When write, set to “0”. When read, its content is
“0”.
Nothing is assigned. When write, set to “0”. When read, its content is
“0”.
b5 b4 b3
RW
BSR1
BSR2
(b1-b0)
(b7-b6)
RW
Note : Effective when the PM01 to PM00 bits are set to “012” (memory expansion mode) or “112” (microprocessor
mode).
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