Panasonic F77G, MN101C77C user manual SC4ICR SC4IE SC4IR LV1 LV0

Models: F77G MN101C77C

1 544
Download 544 pages 59.61 Kb
Page 129
Image 129

Chapter 3 Interrupts

Serial Interface 4 Interrupt Control Register (SC4ICR)

The serial interface 4 interrupt control register (SC4ICR) controls interrupt level of serial interface 4 interrupt, interrupt enable flag and interrupt request. Interrupt control register should be operated when the maskable interrupt enable flag (MIE) of PSW is "0".

SC4ICR

7

6

5

4

4

2

1

0

 

SC4

SC4

-

-

-

-

SC4IE

SC4IR

 

LV1

LV0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(At reset : 0 0 - - - - 0 0)

SC4IR

Interrupt request flag

 

 

0No interrupt request

1Interrupt request generated

SC4IE

Interrupt enable flag

0Disable interrupt

1Enable interrupt

SC4

SC4

Interrupt level flag

LV1

LV0

 

 

 

 

The CPU has interrupt levels from 0 to 3. These flags set the interrupt level for interrupt requests.

Figure 3-2-24 Serial Interface 4 Interrupt Control Register (SC4ICR : x'03FF3', R/W)

Control Registers

III - 35

Page 129
Image 129
Panasonic F77G, MN101C77C user manual SC4ICR SC4IE SC4IR LV1 LV0