C8051T610DB24【PDF 136/218 页】DAUGHTER BOARD T610 24QFN SOCKET

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C8051T610/1/2/3/4/5/6/7

Table 22.1. SMBus Clock Source Selection

SMBCS1

0

0

1

1

SMBCS0

0

1

0

1

SMBus Clock Source

Timer 0 Overflow

Timer 1 Overflow

Timer 2 High Byte Overflow

Timer 2 Low Byte Overflow

T HighMin = T LowMin = ----------------------------------------------

f ClockSourceOverflow

The SMBCS1–0 bits select the SMBus clock source, which is used only when operating as a master or

when the Free Timeout detection is enabled. When operating as a master, overflows from the selected

source determine the absolute minimum SCL low and high times as defined in Equation 22.1. Note that the

selected clock source may be shared by other peripherals so long as the timer is left running at all times.

For example, Timer 1 overflows may generate the SMBus and UART baud rates simultaneously. Timer

configuration is covered in Section “25. Timers” on page 170.

1

f ClockSourceOverflow

Equation 22.1. Minimum SCL High and Low Times

The selected clock source should be configured to establish the minimum SCL High and Low times as per

Equation 22.1. When the interface is operating as a master (and SCL is not driven or extended by any

other devices on the bus), the typical SMBus bit rate is approximated by Equation 22.2.

BitRate = ----------------------------------------------

3

Equation 22.2. Typical SMBus Bit Rate

Figure 22.4 shows the typical SCL generation described by Equation 22.2. Notice that T HIGH is typically

twice as large as T LOW . The actual SCL output may vary due to other devices on the bus (SCL may be

extended low by slower slave devices, or driven low by contending master devices). The bit rate when

operating as a master will never exceed the limits defined by equation Equation 22.1.

Timer Source

Overflows

SCL

T Low

T High

SCL High Timeout

Figure 22.4. Typical SMBus SCL Generation

Setting the EXTHOLD bit extends the minimum setup and hold times for the SDA line. The minimum SDA

setup time defines the absolute minimum time that SDA is stable before SCL transitions from low-to-high.

The minimum SDA hold time defines the absolute minimum time that the current SDA value remains stable

136

Rev 1.1

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