參數(shù)資料
型號: UPD70433R-12
廠商: NEC Corp.
元件分類: 16位微控制器
英文描述: V55PITM 16-BIT MICROPROCESSOR
中文描述: V55PITM 16位微處理器
文件頁數(shù): 39/166頁
文件大?。?/td> 772K
代理商: UPD70433R-12
39
μ
PD70433
4.
BUS CONTROL FUNCTIONS
With the V55PI pin, refer to
1.1.2 (1) "Pin function for bus control"
.
As regards pins which have an alternate function as port pins, when that function is used, the corresponding function
must be selected by means of the port mode control register (PMCn).
4.1
WAIT FUNCTION
The V55PI divides the basic memory space (000000H to 0FFFFFH) into a maximum of 4 blocks with a variable memory
size, divides the uppermost extended memory space area (100000H to FFFFFFH) into two areas with a variable memory
size, and performs wait control for each block. The memory size of each block in the basic memory space is specified by
the memory block control register (MBC).
Figure 4-1 shows the memory block configuration when A9H has been set for the MBC register value.
Figure 4-1. Partitioned Memory Control
MB31
00
00
11
00
01
11
00
01
10
11
Main Memory Space
MBC
Block 0
Block 1
Block 2
Block 3
Block 4
128K Bytes
256K Bytes
512K Bytes
640K Bytes
768K Bytes
896K Bytes
1M Bytes
2M Bytes
4M Bytes
6M Bytes
8M Bytes
10
01
10
01
10
11
Block 5
16M Bytes
1
MB30
0
MB21
1
MB20
0
MB11
1
MB10
1
MB01
0
MB00
1
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