H8SSLASH2218 datasheet(281/750 Pages) RENESAS

281 / 750 page

Section 8 I/O Ports

Rev.6.00 Jun. 03, 2008 Page 233 of 698

REJ09B0074-0600

8.6

Port A

In the H8S/2218 Group, the port A is a 4-bit I/O port also functioning as address bus (A19 to A16)

output pins and SCI I/O pins. In the H8S/2212 Group, the port A is a 3-bit I/O port also

functioning as SCI I/O pins. The port A has the following registers.

• Port A data direction register (PADDR)

• Port A data register (PADR)

• Port A register (PORTA)

• Port A pull-up MOS control register (PAPCR)

• Port A open-drain control register (PAODR)

8.6.1

Port A Data Direction Register (PADDR)

PADDR specifies input or output for the pins of the port A.

Since PADDR is a write-only register, the bit manipulation instructions must not be used to write

PADDR. For details, see section 2.9.4, Accessing Registers Containing Write-Only Bits.

Bit

Bit Name Initial Value

R/W

Description

7 to

⎯

Undefined

⎯

Reserved

These bits are undefined and cannot be modified.

PA3DDR

PA2DDR

PA1DDR

PA0DDR*

(H8S/2218 Group)

Modes 4 to 6:

If address output is enabled by the setting of bits AE3 to

AE0 in PFCR, the corresponding port A pins are address

outputs. When address output is disabled, setting a

PADDR bit to 1 makes the corresponding port A pin an

output port, while clearing the bit to 0 makes the pin an

input port.

Mode 7:

Setting a PADDR bit to 1 makes the corresponding port A

pin an output port, while clearing the bit to 0 makes the

pin an input port.

(H8S/2212 Group)

Setting a PADDR bit to 1 makes the corresponding port A

pin an output port, while clearing the bit to 0 makes the

pin an input port.

Note: * Reserved in the H8S/2212 Group. If this bit is read, an undefined value will be read. This bit

cannot be modified.

H8S/2218 Scheda tecnica(PDF) 281 Page - Renesas Technology Corp

H8S/2218 Scheda tecnica(HTML) 281 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL