Section 26 Boundary Scan (JTAG)
Rev. 1.00 Mar. 12, 2008 Page 1048 of 1178
REJ09B0403-0100
3. The registers are not initialized in standby mode. If the
ETRST
pin is set to 0 in standby mode,
IDCODE mode will be entered.
4. The frequency of the ETCK pin must be lower than that of the system clock. For details, see
section 31, Electrical Characteristics.
5. Data input/output in serial data transfer starts from the LSB. Figure 26.4 and 26.5 shows
examples of serial data input/output.
6. When data that exceeds the number of bits of the register connected between the ETDI and
ETDO pins is serially transferred, the serial data that exceeds the number of register bits and
output from the ETDO pin is the same as that input from the ETDI pin.
7. If the JTAG serial transfer sequence is disrupted, the
ETRST
pin must be reset. Transfer
should then be retried, regardless of the transfer operation.
8. If a pin with a pull-up function is sampled while its pull-up function is enabled, 1 can be
detected at the corresponding input scan register. In this case, the corresponding enable scan
register should be cleared to 0.
9. If a pin with an open-drain function is sampled while its open-drain function is enabled and its
corresponding output scan register is 1, 0 can be detected at the corresponding enable scan
register.
ETDI
SDIR
SDIR
ETDO
Shift register
Shift register
Bit 31
Bit 31
Bit 0
Bit 0
SDIR serial data input/output
SDIR is captured into the shift register in Capture-IR, and bits 0 to 31 of SDIR are output in that order
from the ETDO pin in Shift-IR.
Data input from the ETDI pin is written to SDIR in Update-IR.
.
.
.
.
.
.
.
.
.
.
.
Capture-IR
ETDI
ETDO
Bit 31
Bit 31
Bit 28
Bit 28
.
.
.
Update-IR
Figure 26.4 Serial Data Input/Output (1)
Summary of Contents for H8S Family
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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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