R5F2L3ACBNFP datasheet(197/848 Pages) RENESAS

197 / 848 page

REJ09B0441-0010 Rev.0.10

Jul 30, 2008

Page 161 of 809

Under development Preliminary specification

Specifications in this manual are tentative and subject to change.

10. Power Control

R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,

R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group

10.6

Power-Off Mode

All functions stop in power-off mode. However, the low-speed clock and timer RE functions can be set to operate

or stop by means of register settings. The least power is consumed in this mode.

10.6.1

Pin Handling in Power-Off Mode

Figure 10.5 shows Pin Handling in Power-Off Mode. To use this mode, hardware reset input is required. For

details of hardware resets, refer to 5.2 Hardware Reset.

10.6.2

Entering Power-Off Mode

Table 10.5 lists the register settings in power-off mode.

The pin status in power-off mode and the method of exiting are selected by the initial write to the POMCR0

• Power-off 0

When the POM00 bit is set to 0 (power-off 0) by the initial write, all functions stop once the MCU enters

power-off mode.

• Power-off 1

When the POM00 bit is set to 1 (power-off 1) by the initial write, all functions except the low-speed clock and

timer RE stop once the MCU enters power-off mode. The timer RE interrupt can be used to exit the mode

when power-off 1 is selected.

An access to another register during the write to the POMCR0 register does not affect entering the mode.

10.6.3

Pin Status in Power-Off Mode

Table 10.6 lists the Pin Status in Power-Off Mode. When the MCU enters power-off mode, the contents of

RAM and registers are not retained. Save the data needs to be retained to the data flash before entering power-

off mode.

Figure 10.5

Pin Handling in Power-Off Mode

(1) When power-off mode is used

Always pull up WKUP0.

Pull up WKUP1 when selected as the exit source.

Input a low-level signal to exit the mode.

MCU

VCC

WKUP0

WKUP1

RESET

Input a hardware reset as reset input.

For details of resets, refer to 5.2 Hardware Reset.

RESET

WKUP0

VCC

MCU

(2) When power-off mode is not used

Connect WKUP0 to VSS.

A hardware reset or the power-on reset function

can be used as reset input.

R5F2L3ACBNFP Datasheet(PDF) 197 Page - Renesas Technology Corp

R5F2L3ACBNFP Datasheet(HTML) 197 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

Datasheet Download

Link URL