M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 291

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

Protect
276
2.1 Protect
2.1.1 Overview
'Protect' is a function that causes a value held in a register to be unchanged even when a program runs
away. The following is an overview of the protect function:
(1) Registers affected by the protect function
(2) Protect register
The registers affected by the protect function are:
The values in registers (1) through (3) cannot be changed in write-protect state. To change values in
the registers, put the individual registers in write-enabled state.
Figure 2.1.1 shows protect register.
(a) System clock control registers 0, 1 (addresses 0006
(b) Processor mode registers 0, 1 (addresses 0004
(c) Port P9 direction register (address 03F3
0366
16
)
16
), SI/Oi control register (i=3,4)(addresses 0362
16
and 0005
16
and 0007
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
16
)
16
)
Mitsubishi microcomputers
M16C / 62 Group
16
and