MC68340 datasheet(113/441 Pages) FREESCALE

113 / 441 page

4- 16

MC68340 USER’S MANUAL

MOTOROLA

4.2.5.2 PORT B. Port B pins can be independently programmed to function as chip

selects,

IRQ

≈ and MODCK pins, or discrete I/O pins. These pins are multiplexed as

shown in Figure 4-7. Selection of a pin function is accomplished by a combination of the

port B pin assignment register (PPARB) and the FIRQ bit of the MCR. See Table 4-5 for

port B combinations. By changing the value of the FIRQ bit and the corresponding bits in

the PPARB for a particular signal, the port B pins can be configured for different pin

functions. Upon reset, port B is configured as MODCK,

IRQ7, IRQ6, IRQ5, IRQ3, and

CS3–CS0.

INTERRUPT

PORT

LOGIC

FULL IRQ

MUX

AVEC

CHIP-

SELECT

MODULE

CS1/IRQ1/PORT B1

CS3

CS2

CS1

CS0

CS0/AVEC

FIRQ

CS2/IRQ2/PORT B2

CS3/IRQ4/PORT B4

IRQ3/PORT B3

IRQ5/PORT B5

IRQ6/PORT B6

IRQ7/PORT B7

MODCK/PORT B0

IRQ4/PORT B4

IRQ2/PORT B2

IRQ1/PORT B1

Figure 4-7. Full Interrupt Request Multiplexer

Table 4-5. Port B Pin Assignment Register

Pin Function

Signal

FIRQ = 0

FIRQ = 1

PPARB = 0

PPARB = 1

PPARB = 0

PPARB = 1

IRQ7

PORTB7

IRQ7

PORTB7

IRQ7

IRQ6

PORTB6

IRQ6

PORTB6

IRQ6

IRQ5

PORTB5

IRQ5

PORTB5

IRQ5

IRQ3

PORTB3

IRQ3

PORTB3

IRQ3

CS3

PORTB4

IRQ4

CS2

PORTB2

IRQ2

CS1

PORTB1

IRQ1

CS0

AVEC

MODCK

PORTB0

MODCK

PORTB0

MODCK

NOTE: MODCK has no function after reset.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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