Datasheet

Rev. 3.00, 03/04, page 719 of 830
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.
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Capture-IR
ETDI
ETDO
Bit 31
Bit 31
Bit 28 Bit 28
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Update-IR
Figure 21.4 Serial Data Input/Output (1)