Table 14-1 Non-Integer Prescaler Values; Table 14-2 Non-Integer Prescaler Settings - Motorola MC68VZ328 User Manual

UART Operation
Select (Binary)
000
001
010
011
100
101
110
111
Example 14-1 provides a sample divisor calculation.
33.16 MHz sysclk / 1.8432 MHz for IrDA bit time = 18.0
×
18.0 = 16 + ($20 1/16)
Where:
16 = minimum divisor
$20 = step value
1/16 = step size
Table 14-2 contains the values to program into the non-integer prescaler register for IrDA operation.
14-8
Table 14-1. Non-Integer Prescaler Values
Minimum Divisor
2
4
8
16
32
64
128
—
Example 14-1. Sample Divisor Calculation
Table 14-2. Non-Integer Prescaler Settings
Mode Select (Binary)
IrDA 011
MC68VZ328 User's Manual
Maximum Divisor Step Size
3 127/128
7 63/64
15 31/32
31 15/16
63 7/8
127 3/4
255 1/2
—
Step Value (Hex)
0x20
1/128
1/64
1/32
1/16
1/8
1/4
1/2
—