EM77950 datasheet(79/102 Pages) EMC

79 / 102 page

EM77950

BB Controller

Product Specification (V1.0) 10.09.2007

• 71

(This specification is subject to change without further notice)

Programmed the same clock rate and the same clock edge to latch on both the

master device and slave device.

The received byte will replace the corresponding transmitted byte.

The RBFIF bit will be set, as the SPI operation is completed.

Timing is shown in Fig. 9-2.

SCK:

Serial Clock.

Generated by a master device.

Synchronize the data communication on both the SDI pin and the SDO pin.

The CES used to select the edge to communicate.

The SBR0~SBR2 used to determine the baud rate of communication.

The ES, SBR0, SBR1, and SBR2 bit have no effect in the slave mode.

Timing is shown in Fig. 9-2

SDO:

Serial Data Out

Transmit serially

Programmed the same clock rate and the same clock edge to latch on both the

master device and slave device.

The received byte will replace the transmitted byte.

The SPIS bit will be reset, as the SPI operation is completed.

Timing is shown in Fig. 9-2.

10 Analog to Digital Converter (ADC)

The analog-to-digital circuitry consists of one 16-to-1 multiplexer, two control registers

(ADCAIS and ADCCR), one data register (ADDATA) and one ADC calculator with 8-bit

resolution. The functional block diagram of the ADC is shown in Fig. 10. Port D [7:0]

and Port E [7:0] can be selected as either normal digital I/O ports or analog input ports.

A maximum of 16 analog input pins can be selected by ADCAIS register [5:3], IMS3

~IMS0 bits. Control bits, AIPS3 ~ AIPS0, of ADCCR [3:0] are then used to select the

ADC input channel that will supply analog signal to ADC calculator. CKR2 ~ CKR0

control bits are used to select the desired conversion rate. The ADC module, then,

utilizes successive approximation to convert the unknown analog signal into an 8-bit

digital output value. Finally, the 8-bit result is fed to the ADDATA register. If the ADC

interrupt is enabled, the ADC interrupt flag will be set to “1” as the analog-to-digital

conversion is completed.

EM77950 Datasheet(PDF) 79 Page - ELAN Microelectronics Corp