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R8C датащи(PDF) 42 Page - Renesas Technology Corp

номер детали R8C
подробное описание детали  RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  199 Pages
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производитель  RENESAS [Renesas Technology Corp]
домашняя страница  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C датащи(HTML) 42 Page - Renesas Technology Corp

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R8C/10 Group
9. Bus
Rev.1.20 Jan 27, 2006
page 32 of 180
REJ09B0019-0120
9. Bus
During access, the ROM/RAM and the SFR have different bus cycles. Table 9.1 shows bus cycles for
access space.
The ROM/RAM and SFR are connected to the CPU through an 8-bit bus. When accessing in word (16
bits) units, these spaces are accessed twice in 8-bit units. Table 9.2 shows bus cycles in each access
space.
Space
Even address
byte access
CPU clock
Data
Address
SFR, Data flash
Program ROM/RAM
Even
Odd
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Odd
Odd
Odd+1
Odd
Odd+1
Even
Even
Even+1
Even+1
Data
Address
Data
Address
Data
Address
Data
Address
Data
Address
Data
Address
Data
Address
Odd address
byte access
Even address
word access
Odd address
word access
Data
Even
CPU clock
CPU clock
CPU clock
CPU clock
CPU clock
CPU clock
CPU clock
Table 9.1 Bus Cycles for Access Space
Access space
Bus cycle
SFR/Data flash
2 CPU clock cycles
Program ROM/RAM
1 CPU clock cycles
Table 9.2 Access Unit and Bus Operation



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