M32CSLASH8A datasheet(54/372 Pages) RENESAS

54 / 372 page

M32C/8A Group

6. Power Supply Voltage Detection Function

Rev.1.00

Jul 15, 2007

Page 37 of 352

REJ09B0385-0100

Power Supply Voltage Detection Function

The power supply voltage detection function has the Vdet3 detection function, Vdet4 detection function, and cold

start/warm start determination function. The Vdet3 detection function and Vdet4 detection function detect the changes

in voltage and trigger the events. The cold start/warm start determination function determines whether the MCU is

reset at power-on or reset while running.

The power supply voltage detection function is available only with VCC1 = 4.2V to 5.5V standard.

Figure 6.1 shows a block diagram of the voltage detection circuit. Figures 6.2 to 6.4 show voltage detection-associated

registers.

Figure 6.1

Power Supply Voltage Detection Function Block Diagram

CPU clock

1/2

Digital filter

Watchdog timer

interrupt signal

Vdet4 detection

interrupt signal

Oscillation stop

detection

interrupt signal

Watchdog timer

interrupt request

Vdet3 detection fucntion

00b

01b

10b

11b

DF1 to DF0

1/2

1/8

(rejection range: 200 ns)

D40

D42 bit

CM10: bit in the CM1 register

VC13: bit in the VCR1 register

VC26, VC27: bits in the VCR2 register

DF1 and DF0, D40, D41, D42: bits in the D4INT register

WDC5: bit in the WDC register

NOTE:

1. When the VC27 bit in the VCR2 register is set to 0 (Vdet4 detection function not used), the Vdet4 detection signal becomes "H".

WDC5

Write a given value to

the WDC register

COLD/WARM

(Cold start, warm start)

Hardware reset 1

at power-on

＋

1 shot

Analog Filter

Internal reset signal

(active "L")

Wait time to release hardware reset 2:

td(S-R)

VCC1

VC26

VC27

Vdet4 detection signal(1)

＋

VC13

Cold start/warm start determination function

Vdet4 detection function

CM10

Latch

CM10

WAIT instruction (wait mode)

D41

≥Vdet3

Output one-shot pulse when the

D42 bit becomes 0 to 1.

M32C/8A датащи(PDF) 54 Page - Renesas Technology Corp

M32C/8A датащи(HTML) 54 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL