AT32UC3C2512C-A2UT【PDF 87/110 页】IC MCU AVR32 512K FLASH 64TQFP

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32117DS–AVR-01/12

AT32UC3C

Note:

1. These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same pro-

cess technology. These values are not covered by test limits in production.

Maximum SPI Frequency, Slave Input Mode

The maximum SPI slave input frequency is given by the following formula:

Where

is the MOSI setup and hold time, SPI7 + SPI8 or SPI10 + SPI11 depending on

CPOL and NCPHA.

is the maximum frequency of the CLK_SPI. Refer to the SPI chap-

ter for a description of this clock.

Maximum SPI Frequency, Slave Output Mode

The maximum SPI slave output frequency is given by the following formula:

Where

is the MISO delay, SPI6 or SPI9 depending on CPOL and NCPHA.

is the

SPI master setup time. Please refer to the SPI masterdatasheet for

is the maxi-

mum frequency of the SPI pins. Please refer to the I/O Pin Characteristics section for the

maximum frequency of the pins.

7.9.5

TWIM/TWIS Timing

Figure 7-50 shows the TWI-bus timing requirements and the compliance of the device with

them. Some of these requirements (tr and tf) are met by the device without requiring user inter-

vention. Compliance with the other requirements (tHD-STA, tSU-STA, tSU-STO, tHD-DAT, tSU-DAT-I2C, tLOW-

I2C, tHIGH, and fTWCK) requires user intervention through appropriate programming of the relevant

Table 7-49.

SPI Timing, Slave Mode(1)

Symbol

Parameter

Conditions

Min

Max

Units

SPI6

SPCK falling to MISO delay

external

capacitor =

40pF

SPI7

MOSI setup time before SPCK rises

SPI8

MOSI hold time after SPCK rises

6.5

SPI9

SPCK rising to MISO delay

SPI10

MOSI setup time before SPCK falls

SPI11

MOSI hold time after SPCK falls

SPI12

NPCS setup time before SPCK rises

SPI13

NPCS hold time after SPCK falls

1.5

SPI14

NPCS setup time before SPCK falls

SPI15

NPCS hold time after SPCK rises

1.5

fSPCKMAX

MIN fCLKSPI

SPIn

------------

)

SPIn

fCLKSPI

fSPCKMAX

MIN fPINMAX

SPIn tSETUP

------------------------------------

)

SPIn

tSETUP

tSETUP fPINMAX

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