M16C6K9 Datasheet, PDF (277/292 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6K9 Group
Standard Serial I/O Mode
Outline (standard serial I/O mode)
In standard serial I/O mode, S/W commands, addresses, and data etc. are input and output with the peripheral
device (serial programmer) using 4-wire clock-synchronized serial I/O (UART1). In reception, S/W commands,
addresses and program data are read from RxD10 pin synchronized with the rising edge of the transfer clock
that is input to the CLK10 pin. In transmission, the read data and status are output to TxD10 pin synchronized
with the falling edge of the transfer clock.
The TxD10 is CMOS output pin. Transfer is in 8-bit unit with LSB first.
During transmission, reception, erasing and programming, the RTS10 (BUSY) pin is “H”. Accordingly, always
start the next transfer after the RTS10 (BUSY) pin becomes “L”.
The read after the input of S/W commands can get memory data and status register. Reading the status
register can check the flash memory operation status, the normal/error end of erasing or programming operation.
The following are the explanation of S/W commands, status register etc.
Rev.1.00 Jun 06, 2003 page 277 of 290