SLRC400 Datasheet, PDF (104/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
16.5 Commands to Access the E²PROM
16.5.1 WRITEE2 COMMAND 01_HEX
16.5.1.1 Overview
Command
WriteE2
Code_hex
Action
01
Get data from FIFO buffer and write it to the E²PROM
Arguments and
Data passed via
FIFO
Start Address LSB
Start Address MSB
Data Byte Stream
Returned
Data via
FIFO
-
The WriteE2-Command interprets the first two bytes in the FIFO buffer as E²PROM starting byte-address.
Any further bytes are interpreted as data bytes and are programmed into the E²PROM, starting from the
given E²PROM starting byte-address. This command does not return any data.
The WriteE2-Command can only be started by the µ-Processor. It will not stop automatically but has to be
stopped explicitly by the µ-Processor by issuing the Idle-Command.
16.5.1.2 Programming Process
One byte up to 16 byte can be programmed into the E²PROM in one programming cycle. The time needed
will be in any case about 5.8ms.
The state machine copies all data bytes prepared in the FIFO buffer to the E²PROM input buffer. The internal
E²PROM input buffer is 16 byte long which is equal the block size of the E²PROM. A programming cycle is
started either if the last position of the E²PROM input buffer is written or if the last byte of the FIFO buffer has
been fetched.
As long as there are unprocessed bytes in the FIFO buffer or the E²PROM programming cycle still is in
progress, the flag E2Ready is 0. If all data from the FIFO buffer are programmed into the E²PROM, the flag
E2Ready is set to1. Together with the rising edge of E2Ready the interrupt request flag TxIRq indicates a 1.
This may be used to generate an interrupt when programming of all data is finished.
After the E2Ready bit is set to 1, the WriteE2-Command may be stopped by the µ-Processor by issuing the
Idle-Command.
Important: The WriteE2-Command must not be stopped by starting another command before the E2Ready
flag is set to 1. Otherwise the content of the currently processed E²PROM block will not be defined or in
worst case the SL RC400 functionality is in-reversibly reduced.
104
Preliminary