GL603USB datasheet(25/41 Pages) ETC

25 / 41 page

09/22/00

GL603USB/GL603USB-A/GL603USB-B

Revision 1.4

The byte count buffer is loaded from TXCNT(TXCTL0<3~0>) during endpoint 0 transmit operations. This

same buffer is used for receive transactions to count the number of bytes received at endpoint 0 and, upon

the end of transaction, transfer the value to RXCNT(RXCTL0<3~0>).

When transmitting, the SIE handles parallel-to-serial conversion, CRC generation, NRZI encoding, and bit

stuffing. When receiving, the SIE handles sync detection, packet identification, end-of-packet detection, bit

(un)stuffing, NRZI decoding, CRC validation, and serial-to-parallel conversion. Errors detected by the SIE

include bad CRC, timeout while waiting for EOP, and bit stuffing violations.

All USB devices are required to have an endpoint 0 that is used to initialize and manipulate the device.

Endpoint 0 provides access to the device’s configuration info rmation and allows generic USB status and

control accesses. Endpoint 0 can receive and transmit data. Both receive and transmit data share the same

8-byte Endpoint 0 FIFO, FFDAT0. Received data may overwrite the data previously in the FIFO.

Endpoint 1 is of transmit only. This endpoint is used to transmit HID report data to host.

4.9

INSTRUCTION SET SUMMARY

4.9.1

Operand Field Descriptions

Field

Description

Accumulator

Immediate data

Bit address within a 8-bit register

4.9.2

Instruction Set

Mnemonic,

Operands

Description

Cycles

Flags

Affected

Arithmetic Operations

ADDAR r, A

Add r and A, r <- r + A

CA, HC, ZO

ADDAR A, r

Add A and r, A <- A + r

CA, HC, ZO

ADDAI i

Add A and i, A <- A + i

CA, HC, ZO

INCR r

Increment r, r <- r +1

INCR A, r

Increment r, A <- r + 1

INCRSZ r

Increment r, r <- r +1, skip if (r = 0)

1 or 2

INCRSZ A, r

Increment r, A <- r +1, skip if (A = 0)

1 or 2

SUBAR r, A

Subtract A from r, r <- r - A

CA, HC, ZO

SUBAR A, r

Subtract A from r, A <- r - A

CA, HC, ZO

SUBIA i

Subtract A from i, A <- i - A

CA, HC, ZO

DECR r

Decrement r, r <- r -1

DECR A, r

Decrement r, A <- r -1

DECRSZ r

Decrement r, r <- r-1, skip if (r = 0)

1 or 2

DECRSZ A, r

Decrement r, A <- r – 1, skip if (A = 0)

1 or 2

CLRR r

Clear r, r <- 0

CLRA

Clear A, A <- 0

NOP

No operation

Logical Operations

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