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633
Serial Control Module: UART
D19:00 CT CT
0x00000
Character GAP timer
Defines the required value for the receive character
GAP timer.
Compute the CT value as shown:
CT = (((Timeout * F
CLK
)/4) - 1
where:
F
CLK
= (x1_sys_osc / M) (see Table 364 for
examples)
Timeout = Appropriate timeout in seconds
Use the following equation to define the recommended
character GAP timeout value:
Timeout = (NumBitGap / DataRate)
where:
NumBitGap = The number of bits in a character
plus any start, stop, or parity bits.
DataRate = Interface data rate in bits per second.
Note: When PLL is bypassed, F
CLK
equals BCLK
which equals
x1_sys_osc/8. In most designs BCLK =
(398.1312Mhz / 8) = 49.7664 Mhz
.
Examples:
Timeout=0.1ms ; CT field=0x004DB
Timeout=1.0ms ; CT field=0x03098
Timeout=5.0ms ; CT field=0x0F2FF
The maximum value that can be programmed into the
CT field is
0x7FFFF.
Bits Access Mnemonic Reset Description
Table 375: Serial Channel B/A/C/D Receive Character GAP Timer