HD64F2168 Datasheet, PDF (759/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

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.
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.
ETDI
Bit 31
.
.
.
.
.
.
.
.
.
.
Bit 0 ^.
Bit 31
SDIR
Bit 0
ETDI
Bit 31
Bit 31
.
Bit 28
.
.
Bit 28
SDIR
ETDO
Capture-IR
ETDO
Figure 21.4 Serial Data Input/Output (1)
Update-IR
Rev. 3.00, 03/04, page 719 of 830