MC68340 datasheet(132/441 Pages) FREESCALE

132 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

4- 35

4.3.5.5 PORT B PIN ASSIGNMENT REGISTER (PPARB). PPARB controls the function

of each port B pin. Any set bit defines the corresponding pin to be an

IRQ

≈ input or CS≈

as defined in Table 4-5. Any cleared bit defines the corresponding pin to be a discrete I/O

pin (or

≈ if the FIRQ bit of the MCR is zero) controlled by the port B data and data

direction registers. The MODCK signal has no function after reset. PPARB is configured to

all ones at reset to provide for MODCK,

IRQ7, IRQ6, IRQ5, IRQ3, and CS3–CS0. This

PPARB

$01F

76543210

PPARB7

(IRQ7)

PPARB6

(IRQ6)

PPARB5

(IRQ5)

PPARB4

(IRQ4)

PPARB3

(IRQ3)

PPARB2

(IRQ2)

PPARB1

(IRQ1)

PPARB0

(MODCK)

RESET:

11111111

Supervisor Only

4.3.5.6 PORT B DATA DIRECTION REGISTER (DDRB). DDRB controls the direction of

the pin drivers when the pins are configured as I/O. Any set bit configures the

corresponding pin as an output; any cleared bit configures the corresponding pin as an

input. This register affects only pins configured as discrete I/O. This register can be read

or written at any time.

DDRB

$01D

76543210

DD7

DD6

DD5

DD4

DD3

DD2

DD1

DD0

RESET:

00000000

Supervisor/User

4.3.5.7 PORT B DATA REGISTER (PORTB, PORTB1). This is a single register that can

be accessed at two different addresses. This register affects only those pins configured as

discrete I/O. A write is stored in the internal data latch, and if any port B pin is configured

as an output, the value stored for that bit is driven on the pin. A read of this register

returns the value stored in the register only if the pin is configured as a discrete output.

Otherwise, the value read is the value of the pin. This register can be read or written at

any time.

PORTB, PORTB1

$019, 01B

76543210

RESET:

UUUUUUUU

Supervisor/User

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68340 датащи(PDF) 132 Page - Freescale Semiconductor, Inc

MC68340 датащи(HTML) 132 Page - Freescale Semiconductor, Inc

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

датащи скачать

ссылки URL