SH7721 datasheet(542/1524 Pages) RENESAS

542 / 1524 page

Section 13

Power-Down Modes

Rev. 3.00

Jan. 18, 2008

Page 480 of 1458

REJ09B0033-0300

13.3

There are following five registers related to power-down modes. Refer to section 37, List of

Registers, for more details on the addresses and states of these registers in each operating mode.

• Standby control register (STBCR)

• Standby control register 2 (STBCR2)

• Standby control register 3 (STBCR3)

• Standby control register 4 (STBCR4)

• Standby control register 5 (STBCR5)

13.3.1

Standby Control Register (STBCR)

STBCR is an 8-bit readable/writable register that specifies the state of power-down modes.

Bit

Bit Name

Initial

Value

R/W

Description

STBY

R/W

Standby

Specifies transition to software standby mode.

0: Executing SLEEP instruction enters chip into sleep

mode

1: Executing SLEEP instruction enters chip into software

standby mode

6, 5



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

STBXTL

R/W

Standby Crystal

Specifies halt/operation of a crystal oscillator in standby

mode.

0: Crystal oscillator is halted in standby mode

1: Crystal oscillator is operated continuously in standby

mode

SH7721 Datasheet(PDF) 542 Page - Renesas Technology Corp

SH7721 Datasheet(HTML) 542 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