Rainbow-electronics W90P710CDG Manual de usuario descargar pdf (Pagina 49)

100

101

W90P710CD/W90P710CDG

Publication Release Date: September 19, 2006

- 49 - Revision B2

HCLK

(cache)

Case3. IDLE=0, PD=1, MIDLE=0

EXTAL

idle _state

pd_state

65536 clocks

HCLK

wake up by pheripheral's

interrupts

Fig 6.2.9 Clock management for system power down mode and wake up

6.2.7 Power-On Setting

After power on reset, there are eight Power-On setting pins to configure W90P710 system configuration.

POWER-ON SETTING PIN

Internal System Clock Select D15

Little/Big Endian Mode Select D14

Boot ROM/FLASH Data Bus Width

D [13:12]

Default (Always pull-up in normal operation) D [11:8]

D15 pin：Internal System Clock Select

If pin D15 is pull-down, the external clock from EXTAL pin is served as internal system clock.

If pin D15 is pull-up, the PLL output clock is used as internal system clock.

D14 pin：Little/Big Endian Mode Select

If pin D14 is pull-down, the external memory format is Big Endian mode.

If pin D14 is pull-up, the external memory format is Little Endian mode.

D [13:12] ： Boot ROM/FLASH Data Bus Width

D [13:12] BUS WIDTH

Pull-down Pull-down 8-bit

Pull-down Pull-up 16-bit

Pull-up Pull-down 32-bit

Pull-up Pull-up RESERVED

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 551 552

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Rainbow-electronics W90P710CDG Manual de usuario Pagina 49

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