Section 26
Boundary Scan (JTAG)
Rev. 1.00 Mar. 12, 2008 Page 1021 of 1178
REJ09B0403-0100
26.2 Input/Output
Pins
Table 26.1 shows the JTAG pin configuration.
Table 26.1 Pin Configuration
Pin Name
Abbreviation
I/O
Function
Test clock
ETCK
Input
Test clock input
Provides an independent clock supply to the
JTAG. As the clock input to the ETCK pin is
supplied directly to the JTAG, a clock waveform
with a duty cycle close to 50% should be input.
For details, see section 31, Electrical
Characteristics. If there is no input, the ETCK pin
is fixed to 1 by an internal pull-up.
Test mode select
ETMS
Input
Test mode select input
Sampled on the rise of the ETCK pin. The ETMS
pin controls the internal state of the TAP
controller. If there is no input, the ETMS pin is
fixed to 1 by an internal pull-up.
Test data input
ETDI
Input
Serial data input
Performs serial input of instructions and data for
JTAG registers. ETDI is sampled on the rise of
the ETCK pin. If there is no input, the ETDI pin is
fixed to 1 by an internal pull-up.
Test data output
ETDO
Output
Serial data output
Performs serial output of instructions and data
from JTAG registers. Transfer is performed in
synchronization with the ETCK pin. If there is no
output, the ETDO pin goes to the high-
impedance state.
Test reset
ETRST
Input
Test reset input signal
Initializes the JTAG asynchronously. If there is
no input, the
ETRST
pin is fixed to 1 by an
internal pull-up.
Summary of Contents for H8S Family
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Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
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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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