Toshiba H1 Series Data Book page 180

3.7.24 Port Z (PZ0 to PZ7)
Port Z0 to Z7 are 8-bit general-purpose I/O ports. Each bit can be set individually for
input or output. Resetting sets port Z0 to Z7 to input port and output latch to "0".
In addition to functioning as general-purpose I/O port function, Port Z can also function
as communication for debug mode
EI_REFCLK, EI_TRGIN, EI_COMRESET, EO_MCUDATA and EO_MCUREQ). These
functions are operated when it is started in debug mode. (There is not Function register in
this port. When DBGE is set to "0", this port set to debug communication function.)
Reset
Direction
control
(on bit basis)
PZCR write
R
Output latch
PZ write
PZ read
S
B
Selector
A
EI_PODDATA
EI_SYNCLK
EI_PODREQ
EI_REFCLK
EI_TRGIN
EI_COMRESET
Figure 3.7.66 Port Z0 to Z5
92CZ26A-177
(EI_PODDATA, EI_SYNCLK, EI_PODREQ,
Debug mode
PZ0 (EI_PODDATA)
PZ1 (EI_SYNCLK)
PZ2 (EI_PODREQ)
PZ3 (EI_REFCLK)
PZ4 (EI_TRGIN)
PZ5 (EI_COMRESET)
TMP92CZ26A