M16CSLASH26 datasheet(22/239 Pages) RENESAS

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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.

Figure 1.5.6. VCR1, VCR2, and D4INT registers

Note 2: To use the VCR1 register’s VC13 bit or D4INT register’s D42 bit, set the VC27 bit to “1” (VDET4 detection circuit enabled).

e 1)

VC13

Power supply detection register 1

SymbolAddressAfter reset

VCR1001916

000010002

Bit name

F unction

Bit symbol

b7b6b5b4b3b2b1b0

Power supply detection register 2 (Not

SymbolAddressAfter reset

VCR2001A16

0016

Bit name

Bit symbol

b7b6b5b4b3b2b1b0

Note 1: Write to this register after the PRCR register’s PRC3 bit is set to “1” (write enabled).

0: VCC < VDET4

1: VCC

≥ VDET4

D40

Power supply VDET4 detection register (Note 1)

Symbol

Address

After reset

D4INT

001F16

0016

Bit name

Bit symbol

VC26

VC27

0 :

Disable

1 :

Enable

D41

STOP mode deactivation

control bit

(Note 4)

0: Disable (do not use the VDET4

detection interrupt to get out

of stop mode)

1: Enable (use the VDET4

detection interrupt to get out

of stop mode)

D42

VDET4 up/down detection flag

(Note 2)

0: Not detected

1: VDET4 up/down detected

D43

WDT overflow

detected

flag

0: Not detected

1: Detected

DF0

Sampling clock select

bit

00 : BCLK divided by 8

01 : BCLK divided by 16

10 : BCLK divided by 32

11 : BCLK divided by 64

DF1

Note 1: Write to this register after the PRCR register’s PRC3 bit is set to “1” (write enabled).

Note 3: This bit is cleared to “0” by writing a “0” in a program. (Writing a “1” has no effect.)

Note 4: If the VDET4 detection interrupt needs to be used to get out of stop mode again after once used for that

purpose, reset the D41 bit by writing a 0 and then a 1.

b5b4

(Note

(b7-b6)

0000

000

000000

Function

Reserved bit

Set to “0”

Reserved bit

Set to “0”

Power supply VDET3 monitor

bit

Power supply VDET4 monitor

bit (Note 2)

0: Disables detection circuit

1: Enables detection circuit

(Note

Nothing is assigned. In an attempt to write to these bits, write

“0”. The value, if read, turns out to be “0”.

VDET4 power supply

monitor flag (Note)

Note: The VC13 bit is useful when the VCR2 register's VC27 bit = 1 (VDET4 detection circuit enabled).

The VC13 bit is always 1 (VCC

≥ VDET4) when the VCR2 register's VC27 bit = 0 (VDET4 detection circuit disabled).

0: Disables detection circuit

1: Enables detection circuit

VDET4 detection interrupt

enable bit.

Note 2: Useful when the VCR2 register's VC27 bit = 1 (VDET4 detection circuit enabled). If the VC27 bit is cleared

to 0 (VDET4 detection circuit disabled), the D42 bit is set to 0 (Not detected).

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