M16CSLASH62P datasheet(75/349 Pages) MITSUBISHI

75 / 349 page

Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

Protection

In the event that a program runs out of control, this function protects the important registers so that they will

not be rewritten easily. Figure 1.10.1 shows the PRCR register. The following lists the registers protected

by the PRCR register.

• Registers protected by PRC0 bit: CM0, CM1, CM2, PLC0 and PCLKR registers

• Registers protected by PRC1 bit: PM0, PM1, PM2, TB2SC, INVC0 and INVC1 registers

• Registers protected by PRC2 bit: PD9, S3C and S4C registers

• Registers protected by PRC3 bit: VCR2 and D4INT registers

Set the PRC2 bit to “1” (write enabled) and then write to any address, and the PRC2 bit will be cleared to “0”

(write protected). The registers protected by the PRC2 bit should be changed in the next instruction after

setting the PRC2 bit to “1”. Make sure no interrupts or DMA transfers will occur between the instruction in

which the PRC2 bit is set to “1” and the next instruction. The PRC0, PRC1 and PRC3 bits are not automati-

cally cleared to “0” by writing to any address. They can only be cleared in a program.

Protect register

Symbol

Address

After reset

PRCR

000A16

XX0000002

Bit name

Bit symbol

0 : Write protected

1 : Write enabled

PRC1

PRC0

PRC2

Function

Note: The PRC2 bit is set to “0” by writing to any address after setting it to “1”. Other bits are not set to “0”

by writing to any address, and must therefore be set in a program.

Nothing is assigned. When write, set to “0”. When read, its

content is interdeterminate.

Reserved bit

Must set to “0”

Protect bit 0

Protect bit 1

Protect bit 2

Enable write to CM0, CM1, CM2,

PLC0 and PCLKR registers

0 : Write protected

1 : Write enabled

Enable write to PM0, PM1, PM2,

TB2SC, INVC0 and INVC1

registers

0 : Write protected

1 : Write enabled

Enable write to PD9, S3C and

S4C registers

PRC3

Protect bit 3

0 : Write protected

1 : Write enabled

Enable write to VCR2 and D4INT

registers

(b5-b4)

(b7-b6)

Figure 1.10.1. PRCR Register

M16C/62P Datasheet(PDF) 75 Page - Mitsubishi Electric Semiconductor

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