R28 datasheet(89/473 Pages) RENESAS

89 / 473 page

R8C/28 Group, R8C/29 Group

8. Processor Mode

Rev.2.10

Sep 26, 2008

Page 70 of 441

REJ09B0279-0210

Processor Mode

8.1

Processor Modes

Single-chip mode can be selected as the processor mode.

Table 8.1 lists Features of Processor Mode. Figure 8.1 shows the PM0 Register and Figure 8.2 shows the PM1

Figure 8.1

PM0 Register

Figure 8.2

PM1 Register

Table 8.1

Features of Processor Mode

Processor Mode

Accessible Areas

Pins Assignable as I/O Port Pins

Single-chip mode

SFR, internal RAM, internal ROM All pins are I/O ports or peripheral

function I/O pins

Processor Mode Register 0

(1)

Symbol

Address

After Reset

PM0

0004h

00h

Bit Symbol

Bit Name

Function

NOTE:

Reserved bits

Set to 0.

Set the PRC1 bit in the PRCR register to 1 (w rite enable) before rew riting the PM0 register.

The MCU is reset w hen this bit is set to 1.

When read, the content is 0.

—

(b7-b4)

PM03

Softw are reset bit

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

b7 b6 b5 b4 b3 b2

—

b1 b0

—

(b2-b0)

Processor Mode Register 1

(1)

Symbol

Address

After Reset

PM1

0005h

00h

Bit Symbol

Bit Name

Function

NOTES:

—

(b1-b0)

Reserved bits

Set to 0.

b7 b6 b5 b4 b3 b2

—

b1 b0

0 : Watchdog timer interrupt

1 : Watchdog timer reset(2)

The PM12 bit is set to 1 by a program (and remains unchanged even if 0 is w ritten to it).

When the CSPRO bit in the CSPR register is set to 1 (count source protect mode enabled), the PM12 bit is

automatically set to 1.

Reserved bit

Set to 0.

Set the PRC1 bit in the PRCR register to 1 (w rite enable) before rew riting the PM1 register.

—

(b7)

—

(b6-b3)

PM12

WDT interrupt/reset sw itch bit

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

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