ST72F521R6TA datasheet(91/215 Pages) STMICROELECTRONICS

Part #	ST72F521R6TA

Description	80/64-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

PDF	215 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

91 / 215 page

ST72F521, ST72521B

91/215

SERIAL PERIPHERAL INTERFACE (Cont’d)

10.5.3.2 Slave Select Management

As an alternative to using the SS pin to control the

Slave Select signal, the application can choose to

manage the Slave Select signal by software. This

is configured by the SSM bit in the SPICSR regis-

ter (see Figure 56)

In software management, the external SS pin is

free for other application uses and the internal SS

signal level is driven by writing to the SSI bit in the

SPICSR register.

In Master mode:

–SS internal must be held high continuously

In Slave Mode:

There are two cases depending on the data/clock

timing relationship (see Figure 55):

If CPHA=1 (data latched on 2nd clock edge):

–SS internal must be held low during the entire

transmission. This implies that in single slave

applications the SS pin either can be tied to

VSS, or made free for standard I/O by manag-

ing the SS function by software (SSM= 1 and

SSI=0 in the in the SPICSR register)

If CPHA=0 (data latched on 1st clock edge):

–SS internal must be held low during byte

transmission and pulled high between each

byte to allow the slave to write to the shift reg-

ister. If SS is not pulled high, a Write Collision

error will occur when the slave writes to the

shift register (see Section 10.5.5.3).

Figure 55. Generic SS Timing Diagram

Figure 56. Hardware/Software Slave Select Management

MOSI/MISO

Master SS

Slave SS

(if CPHA=0)

Slave SS

(if CPHA=1)

Byte 1

Byte 2

Byte 3

1

0

SS internal

SSM bit

SSI bit

SS external pin

Similar Part No. - ST72F521R6TA

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	ST72F521R6T3	4Mb / 215P	80/64-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
	ST72F521R6T6	1Mb / 199P	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
	ST72F521R6T6	4Mb / 215P	80/64-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
	ST72F521R6T6	2Mb / 211P	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE August 2003 Rev. 1.9
	ST72F521R6TC	1Mb / 199P	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE

More results

Similar Description - ST72F521R6TA

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	ST72521	2Mb / 211P	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE August 2003 Rev. 1.9
	ST72F321	3Mb / 189P	64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
	ST72521M	105Kb / 11P	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
	ST72325	1Mb / 193P	8-BIT MCU WITH 16 TO 60K FLASH/ROM, ADC, CSS, FIVE TIMERS, SPI, SCI, I2C INTERFACE
	ST72321	4Mb / 189P	64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC,FIVE TIMERS, SPI, SCI, I2C INTERFACE
	ST72F521	4Mb / 215P	80/64-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
	ST72321B	3Mb / 187P	64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface
	ST72325	3Mb / 196P	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface
	ST72325XX	3Mb / 197P	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface
	ST72321M6	2Mb / 175P	80-pin 8-bit MCU with 32 to 60 Kbytes Flash, ADC, five timers, SPI, SCI, I2C interface

More results

ST72F521R6TA Datasheet(PDF) 91 Page - STMicroelectronics

ST72F521R6TA Datasheet(HTML) 91 Page - STMicroelectronics

Similar Part No. - ST72F521R6TA

Similar Description - ST72F521R6TA

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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL