AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 169

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131QC

• Applications: USB Microcontroller
• Core Processor: 8051
• Program Memory Type: ROMless
• Controller Series: AN213x
• Ram Size: 8K x 8
• Interface: I²C, USB
• Number Of I /o: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1307

Figure 9-3 illustrates a typical USB ISR for endpoint 2-IN.
Page 9-6
USB_ISR:
;
;
;
; (perform interrupt routine stuff)
;
;
push
push
push
push
push
push
mov
clr
mov
mov
mov
movx
pop
pop
pop
pop
pop
pop
reti
Figure 9-3. The Order of Clearing Interrupt Requests is Important
dps
dpl
dph
dpl1
dph1
acc
a,EXIF
acc.4
EXIF,a
dptr,#IN07IRQ
a,#00000100b
@dptr,a
acc
dph1
dpl1
dph
dpl
dps
Chapter 9. EZ-USB Interrupts
; FIRST clear the USB (INT2) interrupt request
; Note:
; now clear the USB interrupt request
; use IN2 as example
EXIF reg is not 8051 bit-addressable
EZ-USB TRM v1.9