Renesas R8C/15 Información técnica Pagina 51

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R8C/14 Group, R8C/15 Group 8. Bus
Rev.2.10 Jan 19, 2006 Page 37 of 253
REJ09B0164-0210
8. Bus
During access, the ROM/RAM and SFR vary from bus cycles. Table 8.1 lists Bus Cycles for Access Space
of the R8C/14 Group and Table 8.2 lists Bus Cycles for Access Space of the R8C/15 Group.
The ROM/RAM and SFR are connected to the CPU through an 8-bit bus. When accessing in word-(16 bits)
unit, these area are accessed twice in 8-bit unit. Table 8.3 lists Access Unit and Bus Operation.
Table 8.3 Access Unit and Bus Operation
Table 8.1 Bus Cycles for Access Space of the R8C/14 Group
Access Area Bus Cycle
SFR 2 cycles of CPU clock
ROM/RAM 1 cycle of CPU clock
Table 8.2 Bus Cycles for Access Space of the R8C/15 Group
Access Area Bus Cycle
SFR/Data flash 2 cycles of CPU clock
Program ROM/RAM 1 cycle of CPU clock
Area
SFR, Data flash
Even Address
Byte Access
ROM (Program ROM), RAM
Odd Address
Byte Access
Even Address
Word Access
Odd Address
Word Access
CPU Clock
Data
Data
Data
Data
Data
Data
Data
Data
Data
Even
Even
Odd
Odd
Even+1Even
Odd+1Odd
Address
Even+1
Odd+1
Odd
Data
Data
Even
Data
CPU Clock
Data
Address
CPU Clock
Data
Address
CPU Clock
Data
Address
Data
CPU Clock
Address
Data
CPU Clock
Address
Data
CPU Clock
Address
Data
CPU Clock
Address
Data
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