M16CSLASH1N datasheet(53/238 Pages) RENESAS

53 / 238 page

Rev.1.00

Oct 20, 2004

page 41 of 222

M16C/1N Group

8. Processor Mode

REJ09B0007-0100Z

8. Processor Mode

8.1 Types of Processor Mode

The processor mode is single-chip mode. Table 8.1 lists features of processor mode.

Figure 8.1 shows the processor mode register 0 and 1.

Figure 8.1 Processor mode register 0 and 1

b5 b4

Nothing is assigned.

In an attempt to write to this bit, write "0". The value, if read, turns out to be

indeterminate.

Nothing is assigned.

In an attempt to write to these bits, write "0". The value, if read, turns out to be

indeterminate.

The device is reset when this bit

is set to "1". The value of this bit

is "0" when read.

Note 1: Set bit 1 of the protect register (address 000A16) to "1" when writing new values to this register.

b5 b4

PM12

WDT interrupt/reset

switching bit

DATAROM area access

bit (Note 2)

Nothing is assigned.

In an attempt to write to this bit, write "0". The value, if read, turns out to be

indeterminate.

Nothing is assigned.

In an attempt to write to these bits, write "0". The value, if read, turns out to be

indeterminate.

0 : Watchdog timer interrupt

1 : Reset (Note 3)

Processor mode register 1 (Note 1)

Note 1: Set bit 1 of the protect register (address 000A16) to "1" when writing new values to this register.

Note 2: This bit is valid for the flash memory version. For the mask ROM version, this bit must be set to "0".

Note 3: After setting this bit to "1", can not change to "0" by software.

PM17

Wait bit

0 : No wait

1 : Wait

0 : Disabled

1 : Enabled

Processor mode register 0 (Note 1)

Reserved bit

PM03

Software reset bit

Set to "0"

PM10

Reserved bit

Set to "0"

Symbol

PM0

Address

000416

When reset

XXXX0X002

Symbol

PM1

Address

000516

When reset

00XXX0X02

Function

Bit name

Bit symbol

Function

Bit name

Bit symbol

Table 8.1 Features of processor mode

Processor mode

Access space

Pins to which I/O ports are assigned

Single chip mode

SFR, Internal RAM, Internal ROM All pins are I/O ports or peripheral function I/O pins.

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