M16CSLASH26 datasheet(31/239 Pages) RENESAS

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Processor Mode

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Processor Mode

This device functions in single-chip mode only. In single-chip mode, only internal memory space (SFR,

internal RAM, and internal ROM) can be accessed. Ports P1_5 to P1_7, P6, P7, P8, P9_0 to P9_3 and P10

can be used as programmable I/O ports or as I/O ports for the internal peripheral functions. Figure 1.7.1

shows the processor mode registers 0 and 1. Figure 1.7.2 shows the processor mode register 2.

Figure 1.7.1. Processor mode register 0 and 1

Processor mode register 0 (Note)

Symbol

Address

When reset

PM0

000416

0016

Bit name

Function

Bit symbol

PM03

Software reset bit

The device is reset when this bit is set

to 1. The value of this bit is 0 when

read.

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

values to this register.

Reserved Bit

Must always be set to "0".

Reserved Bit

Must always be set to "0".

Note 3: When EW entry bit (FMR01) =1, this bit is automatically set to 1 during that time.

Note 4: To access the two 2K byte data blocks in address range F80016 to FFFF16, this bit must be set to 1.

Processor mode register 1 (Note 1)

Symbol

Address

When reset

PM1

000516

000010002

Bit name

Function

Bit symbol

Flash data block

access bit (Note 4)

0: Disabled

1: Enabled (Note 3)

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

Note 2: This bit can only be set to 1.

PM17

Wait bit

0 : No wait state

1 : Wait state inserted

Reserved bit

Must always be set to 0 . The

value, if read, turns out to be

indeterminate.

0 : Interrupt

1 : Reset (Note 2)

Watchdog timer function

select bit

PM12

PM10

Reserved bit

Must always be set to "0".

Must always be set to "1".

Reserved bit

Must always be set to "0".

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