Toshiba H1 Series Data Book page 164

3.7.18 Port R (R0 to R3)
Port R0 to R3 are 4-bit general-purpose I/O ports. Each bit can be set individually for
input or output. Resetting sets port R0 to R3 to input port and output latch to "0". In
addition to functioning as general-purpose I/O port pins, PR0 to PR3 can also function as
SPI controller pin (SPCLK, SPCS , SPDO and SPDI).
Above setting is used the control register PRCR and function register PRFC.
Reset
Direction
control
(on bit basis)
Function
control
(on bit basis)
R
Output latch
PR write
SPDI input
PRCR write
PRFC write
Selector
PR read
Figure 3.7.49 Port R0
92CZ26A-161
S
B
A
TMP92CZ26A
PR0(SPDI)