HD64F2145 Datasheet, PDF (231/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

• P90//:5/,545/$'75*/(&65
The pin function is switched as shown below according to the combination of operating mode,
the ABW bit in WSCR, the HI12E and CS2E bits in SYSCR2, the FGA20E bit in HICR, and
the P90DDR bit.
Operating
Mode
Modes 1, 2, 3 (EXPE = 1)
Modes 2, 3 (EXPE = 0)
ABW
0
1
—
HI12E
—
Any one 0
1
FGA20E
—
1
CS2E
—
1
P90DDR
—
0
1
0
1
—
Pin Function /:5 output
P90
pin
input pin
P90 output
pin
P90
input pin
P90 output (&65 input
pin
pin
,545 input pin, $'75* input pin*
Note:* When the IRQ2E bit in IER is set to 1 in mode 1, 2, or 3 (EXPE = 1) with the ABW bit in
WSCR set to 1, or in mode 2 and 3 (EXPE = 0), this pin is used as the ,545 input pin.
When TRGS1 and TRGS0 in ADCR of the A/D converter are both set to 1, this pin is used
as the $'75* input pin.
8.11 Port A
Port A is an 8-bit I/O port. Port A pins also function as keyboard buffer controller I/O pins, key-
sense interrupt input pins, expansion A/D converter input pins, and address output pins. Port A pin
functions change according to the operating mode. Port A input/output operates by VccB power
independent from the Vcc power. Up to 5 V can be applied to port A pins if VccB power is 5 V.
Port A has the following registers. PADDR and PAPIN have the same address.
• Port A data direction register (PADDR)
• Port A output data register (PAODR)
• Port A input data register (PAPIN)
Rev. 2.0, 08/02, page 191 of 788