HD64F2149YV datasheet(280/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 252 of 1044

REJ09B0280-0300

8.11.3

Pin Functions

Port A pins also function as keyboard buffer controller I/O pins (PS2AC, PS2AD, PS2BC,

PS2BD, PS2CC, PS2CD), key-sense interrupt input pins (

KIN15 to KIN8), expansion A/D

converter input pins (CIN15 to CIN8), and address output pins (A23 to A16). The port A pin

functions are shown in table 8.21.

Table 8.21

Port A Pin Functions

Selection Method and Pin Functions

PA7/A23/PS2CD/

KIN15/CIN15

The pin function is switched as shown below according to the combination of

operating mode, the KBIOE bit in KBCR2H of the keyboard buffer controller,

the IOSE bit in SYSCR, and bit PA7DDR.

Operating

mode

Modes 1, 2 (EXPE = 0), 3

Mode 2 (EXPE = 1)

KBIOE

PA7DDR

—

IOSE

——

—

Pin function

PA7

input

PA7

output

PS2CD

output

PA7

input

A23

output

PA7

output

PS2CD

output

KIN15 input pin, CIN15 input pin, PS2CD input pin

When the IICS bit in STCR is set to 1, this pin functions as a bus buffer. This

pin can always be used as the PS2CD,

KIN15, or CIN15 input pin.

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