IBM EM78M611E 8.9 Pattern Detect Application (PDA)

EM78M611E

Universal Serial Bus Series Microcontroller

Product Specification (V1.11) 04.20.2007

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(This specification is subject to change without further notice)

b) Signal from P.92 changes to high, and Pattern Counter value bigger than R10

c) P.92 remains high, and the Pattern Counter value is equal to 0XFF.

d) P.92 remains low, and the Pattern Counter value is equal to 0XFF.

SE2 Pattern Counter Interrupt Conditions: If the Pattern Detection Application function

is enabled, there will be three conditions with which interrupt is generated and the

status flag RF[6] is set to 1(interrupt vector is 0X0001).

a) Signal from P.93 changes to low and the Pattern Counter value is bigger than

R13 register value.

b) Signal from P.93 changes to high and the Pattern Counter value is bigger than

R12 register value.

c) P.93 remains high, and the Pattern Counter value is equal to 0XFF.

d) P.93 remains low, and the Pattern Counter value is equal to 0XFF.

EP0 interrupt: When the UDC successfully accepts a setup transaction from host to

EndPoint0, the status flag RF[1] is set to 1. Its interrupt vector is 0X0001.

USB suspend: When UDC detects a USB Suspend signal on the USB bus, the status

flag RF[2] is set to 1. Its interrupt vector is 0X0001.

USB Reset: When the UDC detects a USB Reset signal on the USB bus, the status flag

R[3] is set to 1. Its interrupt vector is 0X0001.

USB Host Resume: When the UDC detects that the USB bus is no longer in Suspend

condition and without Device Resume signal, the status flag R[7] is set to 1. Its

interrupt vector is 0X0001.

IOCF is an interrupt mask register which can be set bit by bit. While their respective bit

is written to 0, the hardware interrupt will inhibit, that is, the EM78M611E will not jump

to the interrupt vector to execute instructions. But the interrupt status flags still records

the conditions no matter whether the interrupt is masked or not. The interrupt status

flags must be cleared by firmware before leaving the interrupt service routine and

enabling other interrupt.

The global interrupt is enabled by the ENI (RETI) instruction and is disabled by the DISI

instruction.

8.9 Pattern Detect Application (PDA)

This function is designed for the serial signal transmission, e.g., the transmission

between a wireless device and its receiver box. The EM78M611 has two sets of built-in

Pattern Detect Application block that ensures the EM78M611 is equipped with a

compound device, such as the receiver box controller for a wireless keyboard paired

with a wireless mouse.