M16C6K9 Datasheet, PDF (285/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Standard Serial I/O Mode
Read check data
Read check date command is for conforming if the reprogram data sent after page program command have
been received correctly.
(1) Transfer the command code “FD16” in the 1^st byte.
(2) Transfer check data (low) and check data (high) in the 2^nd and 3^rd bytes respectively.
When using read check data command, the command should be issued at first to initialize the check data.
The next is to issue the page program command and related reprogram data. After that, by issuing the read
check data command again, the check data for the reprogram data issued between the two read check data
command can be read out.
Adding the reprogram data in byte unit and then calculating the lower 2 bytes of the added data in two's
complement gives out the check data.
CLK10
RxD10
(M16C reception data)
TxD10
(M16C transmit data)
RTS10(BUSY)
FD16
Check data Check data
(low)
(high)
Fig.EE-12 Timing of read check dt command
Rev.1.00 Jun 06, 2003 page 285 of 290