AT87C5103-ICSIL datasheet(24/64 Pages) ATMEL

24 / 64 page

AT8xC5103

4134C–8051–09/04

Figure 14. SPI Interrupt Requests Generation

Registers

There are three registers in the module that provide control, status and data storage

functions. These registers are describes in the following paragraphs.

Serial Peripheral Control

The Serial Peripheral Control Register does the following:

•

Selects one of the Master clock rates

•

Configure the SPI module as Master or Slave

•

Selects serial clock polarity and phase

•

Enables the SPI module

•

Frees the SS pin for a general purpose

Table 11 describes this register and explains the use of each bit.

SSDIS

MODF

CPU Interrupt Request

SPI Receiver/Error

CPU Interrupt Request

SPI Transmitter

SPI

CPU Interrupt Request

SPIF

Table 11. SPCON Register: Serial Peripheral Control Register - SPCON (S:C3h)

543210

SPR2

SPEN

SSDIS

MSTR

CPOL

CPHA

SPR1

SPR0

Bit

Number

Bit Mnemonic

R/W Mode Description

SPR2

R/W

Serial Peripheral Rate 2

Bit with SPR1 and SPR0 define the clock rate

6SPEN

R/W

Serial Peripheral Enable

Clear to disable the SPI interface (internal reset of the SPI)

Set to enable the SPI interface

SSDIS

R/W

SS Disable

Clear to enable SS in both Master and Slave Modes

Set to disable SS in both Master and Slave Modes. In Slave Mode, this bit has no effect if CPHA = "0"

4MSTR

R/W

Serial Peripheral Master

Clear to configure the SPI as a Slave

Set to configure the SPI as a Master

3CPOL

R/W

Clock Polarity

Clear to have the SCK set to ‘0’ in idle state

Set to have the SCK set to ’1’ in idle low

2CPHA

R/W

Clock Phase

Clear to have the data sampled when the SPSCK leaves the idle state (see CPOL)

Set to have the data sampled when the SPSCK returns to idle state (see CPOL)

SPR1

R/W

Serial Peripheral Rate (SPR2:SPR1:SPR0)

000: N.A.

001: FCLK PERIPH /4

010: FCLK PERIPH /8

011: FCLK PERIPH /16

AT87C5103-ICSIL Scheda tecnica(PDF) 24 Page - ATMEL Corporation

AT87C5103-ICSIL Scheda tecnica(HTML) 24 Page - ATMEL Corporation

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

Scheda tecnica Scarica

Link URL