MC68340 datasheet(316/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

7- 21

Bits 11–8, 6–4—Reserved

SUPV—Supervisor/User

The value of this bit has no affect on registers permanently defined as supervisor only.

1 = The serial module registers, which are defined as supervisor or user, reside in

supervisor data space and are only accessible from supervisor programs.

0 = The serial module registers, which are defined as supervisor or user, reside in

user data space and are accessible from either supervisor or user programs.

IARB3–IARB0—Interrupt Arbitration Bits

Each module that generates interrupts has an IARB field. These bits are used to

arbitrate for the bus in the case that two or more modules simultaneously generate an

interrupt at the same priority level. No two modules can share the same IARB value.

The reset value of the IARB field is $0, which prevents this module from arbitrating

during the interrupt acknowledge cycle. The system software should initialize the IARB

field to a value from $F (highest priority) to $1 (lowest priority).

7.4.1.2 INTERRUPT LEVEL REGISTER (ILR). The ILR contains the priority level for the

serial module interrupt request. When the serial module is enabled (i.e., the STP bit in the

MCR is cleared), this register can be read or written to at any time while in supervisor

mode.

ILR

$704

76543210

00000

IL2

IL1

IL0

RESET:

00000000

Read/Write

Supervisor Only

Bits 7–3—Reserved

IL2–IL0—Interrupt Level Bits

Each module that can generate interrupts has an interrupt level field. The priority level

encoded in these bits is sent to the CPU32 on the appropriate

IRQ

≈ signal. The CPU32

uses this value to determine servicing priority. The hardware reset value of $00 will not

generate any interrupts. See Section 5 CPU32 for more information.

7.4.1.3 INTERRUPT VECTOR REGISTER (IVR). The IVR contains the 8-bit vector

number of the interrupt. When the serial module is enabled (i.e., the STP bit in the MCR is

cleared), this register can be read or written to at any time while in supervisor mode.

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