C8051F336DK Silicon Laboratories Inc, C8051F336DK Datasheet - Page 143
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C8051F336DK
Manufacturer Part Number
C8051F336DK
Description
DEV KIT FOR C8051F336
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F336DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F33x
Interface Type
USB, UART
Operating Supply Voltage
7 V to 15 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F336
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1430
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after SCL transitions from high-to-low. EXTHOLD should be set so that the minimum setup and hold times
meet the SMBus Specification requirements of 250 ns and 300 ns, respectively. Table 21.2 shows the min-
imum setup and hold times for the two EXTHOLD settings. Setup and hold time extensions are typically
necessary when SYSCLK is above 10 MHz.
With the SMBTOE bit set, Timer 3 should be configured to overflow after 25 ms in order to detect SCL low
timeouts (see Section “21.3.4. SCL Low Timeout” on page 140). The SMBus interface will force Timer 3 to
reload while SCL is high, and allow Timer 3 to count when SCL is low. The Timer 3 interrupt service routine
should be used to reset SMBus communication by disabling and re-enabling the SMBus.
SMBus Free Timeout detection can be enabled by setting the SMBFTE bit. When this bit is set, the bus will
be considered free if SDA and SCL remain high for more than 10 SMBus clock source periods (see
Figure 21.4).
Note: Setup Time for ACK bit transmissions and the MSB of all data transfers. When using
EXTHOLD
software acknowledgement, the s/w delay occurs between the time SMB0DAT or
ACK is written and when SI is cleared. Note that if SI is cleared in the same write
that defines the outgoing ACK value, s/w delay is zero.
0
1
Table 21.2. Minimum SDA Setup and Hold Times
Minimum SDA Setup Time
1 system clock + s/w delay
T
low
11 system clocks
– 4 system clocks
or
Rev.1.0
*
Minimum SDA Hold Time
12 system clocks
3 system clocks
C8051F336/7/8/9
143
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