AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 110

• 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

The following code illustrates the EZ-USB registers used for a simple bulk transfer. In
this example, 8051 register R1 keeps track of the number of endpoint 2-IN transfers and
register R2 keeps track of the number of endpoint 2-OUT transfers (mod-256). Every
endpoint 2-IN transfer consists of 64 bytes of a decrementing count, with the first byte
replaced by the number of IN transfers and the second byte replaced by the number of
OUT transfers.
EZ-USB TRM v1.9
6.11
1
2
3
4
5
6
7
8
9
10
11
12
13
14 ;
15 loop:
16 movx
17
18
19
20
21 ;
22 serviceOUT2:
23
24
25
26
27 ;
28 serviceIN2:
29
30
31
32
33
34
35
36
37
38
39
40 ;
41
start:
fill:
;
Polled Bulk Transfer Example
Figure 6-6. Example Code for a Simple (Polled) BULK Transfer
mov
mov
mov
mov
movx
inc
djnz
mov
mov
mov
mov
movx
mov
a,@dptr
jnb
mov
movx
jb
inc
mov
movx
sjmp
inc
mov
mov
movx
inc
mov
movx
mov
mov
movx
sjmp
END
SP,#STACK-1
dptr,#IN2BUF
r7,#64
a,r7
@dptr,a
dptr
r7,rill
r1,#0
r2,#0
dptr,#IN2BC
a,#40h
@dptr,a
dptr,#IN2CS
acc.1,serviceIN2
dptr,#OUT2CS
a,@dptr
acc.1,loop
r2
dptr,#OUT2BC
@dptr,a
loop
r1
dptr,3IN2BUF
a,r1
@dptr,a
dptr
a,r2
@dptr,a
dptr,#IN2BC
a,#40h
@dptr,a
loop
Chapter 6. EZ-USB CPU
; set stack
; fill EP2IN buffer with
; decrementing counter
; r1 is IN token counter
; r2 is OUT token counter
; Point to EP2 Byte Count register
; 64-byte transfer
; arm the IN2 transfer
; poll the EP2-IN Status
; not busy--keep looping
; EP2OUT is busy--keep looping
; OUT packet counter
; load byte count register to re-arm
; (any value)
; IN packet counter
; update the first data byte
; in EP2IN buffer
; second byte in buffer
; get number of OUT packets
; point to EP2IN Byte Count Register
; load bc=64 to re-arm IN2
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