Hitachi H8S/2678 Series Reference Manual page 229

Pin Selection Method and Pin Functions
P21/PO1/ The pin function is switched as shown below according to the combination of the
TIOCB3/IRQ9 TPU channel 3 settings (by bits MD3 to MD0 in TMDR3, bits IOB3 to IOB0 in
TIOR3H, and bits CCLR2 to CCLR0 in TCR3), bit NDER1 in NDERL, bit
P21DDR, and bit ITS9 in ITSR.
TPU channel 3
settings
P21DDR
NDER1
Pin function
Notes: 1. TIOCB3 input when MD3 to MD0 = B'0000 and IOB3 to IOB0 = B'10xx.
TPU channel 3
settings
MD3 to MD0
IOB3 to IOB0
CCLR2 to
CCLR0
Output function
212
(1) in table
below
—
—
TIOCB3 output
2. IRQ9 input when ITS9 = 1.
(2)
B'0001 to B'0011
B'0000 B'0001 to B'0011
B'0100 B'0101 to B'0111
B'1xxx
—
—
0
—
P21 input
IRQ9 interrupt input pin*
(1) (2)
B'0010
—
— —
Output compare —
output
(2) in table below
1
0
P21 output PO1 output
1
TIOCB3 input*
2
(2) (1)
B'0011
B'xx00 Other than B'xx00
— Other
than
B'010
— PWM
mode 2
output
1
1
(2)
B'010
—
x: Don't care