Section 6 Bus Controller (BSC)
Rev. 1.00 Mar. 12, 2008 Page 128 of 1178
REJ09B0403-0100
6.5.3
Valid Strobes (in Glueless Extension)
Table 6.14 shows the data buses used and valid strobes for each access space.
The
RD
and
WR
signals are valid for both the upper and lower halves of the data bus. In a write,
the
HBE
signal is valid for the upper half of the data bus, and the
LBE
signal for the lower half.
Table 6.14 Data Buses Used and Valid Strobes (Gluless Extension)
Area
Access
Size
Read/
Write
Address
Valid
Strobe
Upper Data Bus
(D15 to D8)
Lower Data
Bus (D7 to D0)
Byte Read
—
RD
Valid
Ports or others
8-bit access
space
Write
—
WR
Byte Read
Even
RD
,
HBE
Valid
Invalid
Odd
RD
,
LBE
Invalid
Valid
Write
Even
WR
,
HBE
Valid
Undefined
Odd
WR
,
LBE
Undefined
Valid
Word Read —
RD
,
HBE
,
LBE
Valid Valid
16-bit access
space
Write
—
WR
,
HBE
,
LBE
[Legend]
Undefined:
Undefined data is output.
Invalid:
Input state with the input value ignored.
Ports or others: Used as ports or I/O pins for on-chip peripheral modules, and are not used as the
data bus.
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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