Renesas Single-Chip Microcomputer M37531T-ADS Informações Técnicas descarregar pdf (Página 11)

Mitsubishi microcomputer

M16C / 62A Grou

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTE

Protect

2-1

2.1.3 Precaution for Protect

(1) The write-enable bit of port 9 direction register and

SI/Oi control register (i=3,4)

goes to “0”

when the next write instruction is executed after write-enabled state is readied. Make

changes in input/output and

SI/Oi control register (i=3,4)

immediately after the instruction that

sets “1” in the write-enable bit of port P9 direction register and

SI/Oi control register

(i=3,4)

(avoid causing an interrupt). Also take measures to prevent DMA transfer from being

executed.

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