AN2131SC Cypress Semiconductor Corp, AN2131SC Datasheet - Page 164

• Manufacturer Part Number: AN2131SC
• Description: IC MCU 8051 8K RAM 24MHZ 44QFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

Specifications of AN2131SC

• 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: 16
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1306; AN2131SC

The EZ-USB enhanced 8051 responds to the interrupts shown in Table 9-1. Interrupt
sources that are not present in the standard 8051 are shown as checked in the “New” col-
umn. The three interrupts used by the EZ-USB core are shown in bold type.
The Natural Priority column in Table 9-1 shows the 8051 interrupt priorities. As
explained in Appendix C, the 8051 can assign each interrupt to a high or low priority
group. The 8051 resolves priorities within the groups using the natural priorities.
The EZ-USB core provides three interrupt request types, which are described in the fol-
lowing sections:
EZ-USB TRM v1.9
9.1
9.2
Wakeup - After the EZ-USB chip detects USB suspend and the 8051 has entered
Introduction
USB Core Interrupts
New 8051 Interrupt (IRQ name)
P
P
P
P
P
P
P
P
its idle state, the EZ-USB core responds to an external signal on its
WAKEUP# pin or resumption of USB bus activity by re-starting the EZ-
USB oscillator and resuming 8051 operation.
IE0
TF0
IE1
TF1
RI_0 & TI_0
TF2
Resume (PFI)
RI_1 & TI_1
USB (INT2)
I
IE4
IE5
IE6
2
C (INT3)
9 EZ-USB Interrupts
Table 9-1. EZ-USB Interrupts
Chapter 9. EZ-USB Interrupts
INT0# Pin
Timer 0 Overflow
INT1# Pin
Timer 1 Overflow
UART0 Rx & Tx
Timer 2 Overflow
WAKEUP# Pin or USB Core
UART1 Rx & Tx
USB Core
USB Core
IN4 Pin
INT5# Pin
INT6 Pin
Source
Vector (hex) Natural Priority
03
0B
13
1B
23
2B
33
3B
43
4B
53
5B
63
10
12
11
2
4
6
0
8
1
3
5
7
9
Page 9-1