Section 21 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 1.00 Mar. 12, 2008 Page 795 of 1178
REJ09B0403-0100
Bit Bit
Name
Initial
value
R/W Description
0 SWR 0 R/W
Software
Reset
Writing 1 in this bit initializes registers of the E-DMAC
other than TDLAR, RDLAR, RMFCR, and ECBRR, and
registers of the EtherC. While a software reset is issued
(for 64 states), accesses to the all Ethernet-related
registers are prohibited.
Software reset period (example):
When
φ
= 34 MHz: 1.88
µ
s
This bit is always read as 0.
0: Writing 0 is ignored (E-DMAC operation is not
affected)
1: Writing 1 resets the EtherC and E-DMAC and then
automatically cleared
21.2.2
E-DMAC Transmit Request Register (EDTRR)
The EDTRR is a 32-bit readable/writable register that issues transmit directives to the E-DMAC.
When transmission of one frame is completed, the next descriptor is read. If the transmit
descriptor active bit in this descriptor has the "active" setting, transmission is continued. If the
transmit descriptor active bit has the "inactive" setting, the TR bit is cleared and operation of the
transmit DMAC is halted.
Bit Bit
Name
Initial
value
R/W Description
31 to 1
All
0
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
0 TR 0 R/W
Transmit
Request
Check TR = 0 before transmission is started.
0: Transmission-halted state. Writing 0 does not stop
transmission. Termination of transmission is
controlled by the active bit in the transmit descriptor
1: Start of transmission. The relevant descriptor is read
and a frame is sent with the transmit active bit set to
1
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...
Page 1226: ...Rev 1 00 Mar 12 2008 Page 1178 of 1178 REJ09B0403 0100...
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Page 1230: ...H8S 2472 Group H8S 2462 Group Hardware Manual...