M16CSLASH29 datasheet(64/499 Pages) RENESAS

64 / 499 page

5. Resets

page 40

Figure 5.7 Typical Operation of Brown-Out Detection Reset (Hardware Reset 2)

Figure 5.6 D4INT Register

D40

Low Voltage Detection Interrupt Register (1)

Symbol

Address

After Reset

D4INT

001F16

0016

Low voltage detection

interrupt enable bit (5)

Bit Name

Bit Symbol

b7 b6 b5 b4 b3 b2 b1 b0

0 :

Disable

1 :

Enable

D41

STOP mode deactivation

control bit (4)

0: Disable (do not use the low

voltage detection interrupt to exit

stop mode)

1: Enable (use the low voltage

detection interrupt to exit stop

mode)

D42

Voltage change detection flag

(2)

0: Not detected

1: Vdet4 passing detection

D43

WDT overflow detect flag

0: Not detected

1: Detected

DF0

Sampling clock select bit

00 : CPU clock divided by 8

01 : CPU clock divided by 16

10 : CPU clock divided by 32

11 : CPU clock divided by 64

DF1

NOTES:

1. Write to this register after setting the PRC3 bit in the PRCR register to 1 (write enable).

2. Useful when the VC27 bit in the VCR2 register is set to 1 (low voltage detection circuit enabled). If the VC27

bit is set to 0 (low voltage detection circuit disable), the D42 bit is set to 0 (Not detect).

3. This bit is set to 0 by writing a 0 in a program. (Writing 1 has no effect.)

4. If the low voltage 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.

5. The D40 bit is effective when the VC27 bit in the VCR2 register is set to 1. To set the D40 bit to 1, follow the

procedure described below.

(1) Set the VC27 bit to 1.

(2) Wait for td(E-A) until the detection circuit is actuated.

(3) Wait for the sampling time (refer to Table 5.3 Sampling Clock Periods).

(4) Set the D40 bit to 1.

b5b4

(3)

(b7-b6)

Function

(3)

Nothing is assigned. If necessary set to 0. When read, the

content is 0

Vdet4

Vdet3

5.0V

VCC

Internal Reset Signal

VC13 bit in

VCR1 register

VC26 bit in

VCR2 register (1)

VC27 bit in

VCR2 register

Set to 1 by program (reset level detect circuit enable)

Set to 1 by program

(low voltage detection circuit enable)

VSS

Undefined

RESET

Vdet3s

Vdet3r

NOTES :

1. VC26 bit is invalid in stop mode. (the MCU is not reset even if input voltage of VCC pin

becomes lower than Vdet3).

Undefined

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