M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 294

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

Protect
Figure 2.1.2. Set-up procedure for protect function
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.
(2)
(5)
b7
(1) Clearing the protect (set to write-enabled state)
b7
b7
(3) Setting the protect (set to write-inhibited state)
(4) Clearing the protect (set to write-enabled state)
1
Changes in port P9 or changes in SI/Oi control register (i=3,4)
b0
b0
b0
1
0
Enables writing to system clock control registers 0 and 1 (addresses 0006
Enables writing to port P9 direction register (address 03F3
(i=3,4) (addresses 0362
Enables writing to system clock control registers 0 and 1 (addresses 0006
Enables writing to system clock control registers 0 and 1 (addresses 0006
Enables writing to port P9 direction register (address 03F3
(i=3,4) (addresses 0362
Enables writing to port P9 direction register (address 03F3
i=3,4) (addresses 0362
1 : Write-enabled
0 : Write-inhibited
1 : Write-enabled
0 : Write-inhibited
1 : Write-enabled
1 : Write-enabled
0 : Write-inhibited
1 : Write-enabled
0 : Write-inhibited
Protect register [Address 000A
PRCR
Protect register [Address 000A
PRCR
Protect register [Address 000A
PRCR
Setting system clock control register i (i = 0, 1)
16
16
16
and 0366
and 0366
and 0366
16
16
16
]
]
]
16
16
16
)
)
)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
16
16
16
) and SI/Oi control register
) and SI/Oi control register (
) and SI/Oi control register
16
16
16
Mitsubishi microcomputers
M16C / 62 Group
and 0007
and 0007
and 0007
16
16
16
)
)
)
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