HT82K75REW datasheet(63/103 Pages) HOLTEK

63 / 103 page

HT82M75REW/HT82K75REW

Rev. 1.00

June 11, 2010

RF Transceiver Wake-up Operation

After entering into Power Saving Mode, the RF Transceiver could be waked up by the internal register trigger. One and

only one method should be used for wake-up operation.

· Configure clock recovery time

WAKECNT, used to calculate for recovery time of 32MHz clock of the RF Transceiver, should be set in advance. User

shall follow the following two steps to configure WAKECNT.

¨ Calculate the period of sleep clock

Set LREG0x20B [4] to 1 and then keep polling LREG0x20B [7] until the value becomes 1. After the value of

LREG0x20B [7] becomes 1, LREG0x20B [3:0], LREG0x20A, LREG0x209 form a 20-bit value C. Then the period

of the sleep clock (Psleepclock) can be calculated by the following equation:

Psleepclock=

62 5

()

If the sleep clock frequency is higher than the expected value, user can configure LREG0x220 [4:0] to slow down

the clock rate. The new clock period Psleepclock_new is obtained by the following equation:

Psleepclock_new =Psleepclock_ori

´ 2 LREG0x220[4:0] (ns)

¨ Configure WAKECNT to set the recovery time of 32MHz clock to 180

Set WAKECNT, i.e. SREG0x36 [4:3] and SREG0x35 [6:0], to (1000*180) / Psleepclock. For example, the period of the

sleep clock, Psleepclock, is 10000ns. Set SREG0x36 [4:3] and SREG0x35 [6:0]} to 0x12.

User can wake the RF Transceiver up from STANDBY and DEEP_SLEEP modes by simply setting SREG0x22 [7:6] to

²11².

When the RF Transceiver is woken up by Register trigger, the following steps shall be executed to complete the opera-

tion:

· Wait the RF Transceiver issues a wake-up interrupt. The related wake-up interrupt flag is stored in SREG0x31 [6].

· Turn on SPISYNC function by setting SREG0x26 [5] to 1.

· Setting the LREG0x250 [4] to 1 to turn off the on-chip DC-DC converter.

Registers associated with Power Saving Operation:

Addr.

File Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

0x0D

RXFLUSH

rrrrr

PTX

RXFLUSH

0110 0000

0x22

WAKECTL

IMMWAKE

REGWAKE

rrrrrr

0100 0000

0x26

GATECLK

SPISYNC

ENTXM

0000 0000

0x31

ISRSTS

WAKEIF

RXIF

TXNIF

0000 0000

0x35

SLPACK

WAKECNT6 WAKECNT5 WAKECNT4 WAKECNT3 WAKECNT2 WAKECNT1 WAKECNT0

0000 0000

0x36

RFCTL

WAKECNT8 WAKECNT7

RFRST

0000 0000

0x209

SLPCAL_0

SLPCAL7

SLPCAL6

SLPCAL5

SLPCAL4

SLPCAL3

SLPCAL2

SLPCAL1

SLPCAL0

0000 0000

0x20A

SLPCAL_1

SLPCAL15

SLPCAL14

SLPCAL13

SLPCAL12

SLPCAL11

SLPCAL10

SLPCAL9

SLPCAL8

0000 0000

0x20B

SLPCAL_2

SLPCALRD

SLPCALEN

SLPCAL19

SLPCAL18

SLPCAL17

SLPCAL16

0000 0000

0x250

RFCTRL50

DCPOC

DCOPC3

DCOPC2

DCOPC1

DCOPC0

-0000 0000

HT82K75REW Datasheet(PDF) 63 Page - Holtek Semiconductor Inc

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