3

PCCchip2

Printer PE Interrupt Control Register

ADR/SIZ

 

 

 

 

$FFF42033 (8 bits)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

7

6

 

5

 

4

3

 

2

 

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NAME

PLTY

E/L*

 

INT

 

IEN

ICLR

 

IL2

 

IL1

 

IL0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPER

R/W

R/W

 

R

 

R/W

C

 

R/W

 

R/W

 

R/W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET

0 PL

0 PL

 

0 PL

 

0 PL

0 PL

 

0 PL

 

0 PL

 

0 PL

 

 

 

 

 

 

 

 

 

 

 

IL2-IL0

 

These three bits select the interrupt level for the printer

 

 

 

PE. Level 0 does not generate an interrupt.

 

 

ICLR

 

In edge-sensitive mode, writing a logic 1 to this bit clears

 

 

 

the INT status bit. This bit has no function in level-

 

 

 

sensitive mode. This bit is always read as zero.

 

 

IEN

 

When this bit is high, the interrupt is enabled. The

 

 

 

 

interrupt is disabled when this bit is low.

 

 

 

 

INT

 

When this bit is high, a printer PE interrupt is being

 

 

 

generated at the level programmed in IL2-IL0 (if

 

 

 

 

nonzero).

 

 

 

 

 

 

 

 

 

 

E/L*

 

When this bit is high, the interrupt is edge-sensitive. The

 

 

 

interrupt is level-sensitive when this bit is low.

 

 

PLTY

 

When this bit is low, interrupt is activated by a rising

 

 

 

edge/high level of the PE pin.

 

 

 

 

 

When this bit is high, interrupt is activated by a falling edge/low level of the PE pin.

Note that if this bit is changed while the E/L* bit is set (or is being set), a PE interrupt may be generated. This can be avoided by setting the ICLR bit during write cycles that change the E/L* bit.

3-42

Computer Group Literature Center Web Site

Page 240
Image 240
Motorola MVME1X7P manual Printer PE Interrupt Control Register, PE. Level 0 does not generate an interrupt