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H8/3021 数据表(PDF) 48 Page - Renesas Technology Corp

部件名 H8/3021
功能描述  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3021 数据表(HTML) 48 Page - Renesas Technology Corp

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2. CPU
Rev.2.00 Mar. 22, 2007 Page 24 of 684
REJ09B0352-0200
Rn
En
ERn
Word data
Word data
Longword data
General
Register
Data Type
Data Format
15
0
MSB
LSB
15
0
MSB
LSB
31
16
MSB
15
0
LSB
Legend
ERn:
En:
Rn:
MSB:
LSB:
General register
General register E
General register R
Most significant bit
Least significant bit
Figure 2.7 General Register Data Formats
2.5.2
Memory Data Formats
Figure 2.8 shows the data formats on memory. The H8/300H CPU can access word data and
longword data on memory, but word or longword data must begin at an even address. If an attempt
is made to access word or longword data at an odd address, no address error occurs but the least
significant bit of the address is regarded as 0, so the access starts at the preceding address. This
also applies to instruction fetches.



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