Section 20 Ethernet Controller (EtherC)
Rev. 1.00 Mar. 12, 2008 Page 783 of 1178
REJ09B0403-0100
(2) MII Register Access Procedure
The program accesses MII registers via the PHY interface register (PIR). Access is implemented
by a combination of 1-bit-unit data write, 1-bit-unit data read, bus release, and independent bus
release. Figures 20.8 to 20.11 show examples of MII register access timing. The timing will differ
depending on the type of PHY-LSI.
MDC
MDO
(1)
(2)
(3)
(1)
(2)
(3)
Write to PHY interface register
MMD = 1
MDO = write data
MDC = 0
MMD = 1
MDO = write data
MDC = 1
Write to PHY interface register
MMD = 1
MDO = write data
MDC = 0
Write to PHY interface register
Figure 20.8 1-Bit Data Write Flowchart
MDC
MDO
(1)
(2)
(3)
(1)
Write to PHY interface register
MMD = 0
MDC = 0
(2)
Write to PHY interface register
MMD = 0
MDC = 1
(3)
Write to PHY interface register
MMD = 0
MDC = 0
Figure 20.9 Bus Release Flowchart (TA in Read in Figure 20.7)
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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