upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 124

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Chapter 3
a)
124
Write protected register
Clock control register
Watchdog timer clock
control register
Processor clock control
register
Watch Timer clock control
register
SPCLK control register
FOUTCLK control register
I
Main oscillator clock
monitor mode register
Sub oscillator clock monitor
mode register
Power save control register
Self-programming enable
control register
Watchdog timer frequency
select register
Watchdog timer mode
register
N-Wire security disable
control register
2
C clock control register
Flash memory devices only
Table 3-15
a
3.6 Write Protected Registers
Write protected registers are protected from inadvertent write access due to
erroneous program execution, etc. Write access to a write protected register is
only given immediately after writing to a corresponding write enable register.
For a write access to the write protected registers you have to use the following
instructions:
1. Store instruction (ST/SST instruction)
2. Bit operation instruction (SET1/CLR1/NOT1 instruction)
When reading write protected registers, no special sequence is required.
The following table gives an overview of the write protected registers and their
corresponding write enable registers.
For some registers, incorrect store operations can be checked by a flag of the
corresponding status register. This is also marked in the table below.
Overview of write protected registers
Preliminary User’s Manual U17566EE1V2UM00
RSUDISC
Shortcut
SELFEN
WDTM
WDCS
CLMM
CLMS
WCC
CKC
PCC
TCC
SCC
FCC
PSC
ICC
Corresponding write
Peripheral command
Main oscillator clock
Sub oscillator clock
Command register
monitor command
protection register
monitor command
protection register
protection register
Sequence protect
enable register
security register
Watchdog timer
RSUDISC write
register
register
PRCMDCMM
PRCMDCMS
RSUDISCP
SELFENP
Shortcut
PHCMD
PRCMD
WCMD
register
Status
WPHS
PHS
CPU System Functions
––
–
–
–
“Clock Generator“
“Clock Generator“
“Clock Generator“
Unit“ on page 877
“Watchdog Timer
“On-Chip Debug
“Flash Memory“
For details see
on page 129
on page 129
on page 129
on page 229
(WDT)“ on
page 497