M16CSLASH62M datasheet(259/615 Pages) RENESAS

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Appendix Standard Serial I/O Mode 1 (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

1-240

Overview of standard serial I/O mode 1 (clock synchronized)

In standard serial I/O mode 1, software commands, addresses and data are input and output between the

MCU and peripheral units (serial programer, etc.) using 4-wire clock-synchronized serial I/O (UART1).

Standard serial I/O mode 1 is engaged by releasing the reset with the P65 (CLK1) pin "H" level.

In reception, software commands, addresses and program data are synchronized with the rise of the

transfer clock that is input to the CLK1 pin, and are then input to the MCU via the RxD1 pin. In transmis-

sion, the read data and status are synchronized with the fall of the transfer clock, and output from the

TxD1 pin.

The TxD1 pin is for CMOS output. Transfer is in 8-bit units with LSB first.

When busy, such as during transmission, reception, erasing or program execution, the RTS1 (BUSY) pin

is "H" level. Accordingly, always start the next transfer after the RTS1 (BUSY) pin is "L" level.

Also, data and status registers in memory can be read after inputting software commands. Status, such

as the operating state of the flash memory or whether a program or erase operation ended successfully or

not, can be checked by reading the status register. Here following are explained software commands,

status registers, etc.

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