STR720 datasheet(341/401 Pages) STMICROELECTRONICS

部件名	STR720

功能描述	ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES

PDF	401 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

341 / 401 page

STR720 - S-D ANALOG/DIGITAL CONVERTER (ADC)

341/401

ADC Clock Prescaler Register (ADCCPR)

Address Offset: 30h

Reset Value: 0006h

Bits 15:7 = Reserved. These bits should be always written as ‘0’.

Bits 6:0 = PRESC[6:0]: Prescaler value

The 7 bit binary value specified on the clock prescaler register determines the factor by which

the ADC input clock will be divided down in order to produce the oversampling clock of the

sigma-delta modulator, the actual factor being twice the PRESC register value as illustrated in

Table 70 on page 341. The value placed in this register must subsequently generate an

oversampling clock frequency not greater than 4 MHz from the master clock applied to the

ADC. These bits can only be written by software, any read operation on them returns 0h.

Reserved

PRESC[6:0]

-w

Table 70. ADC Prescaler setting

Setting

Divide Factor

Not available (ADC frozen)

126

252

127

254

STR720 数据表(PDF) 341 Page - STMicroelectronics