C8051F712-GQR Silicon Labs, C8051F712-GQR Datasheet - Page 224
C8051F712-GQR
Manufacturer Part Number
C8051F712-GQR
Description
8-bit Microcontrollers - MCU 8kB 32B EEPROM ADC Cap Sense
Manufacturer
Silicon Labs
Datasheet
1.C8051F709-GQR.pdf
(306 pages)
Specifications of C8051F712-GQR
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
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C8051F70x/71x
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 “30.3.4. SCL Low Timeout” on page 221). 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 30.4).
224
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 30.2. 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
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