z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 131

• Manufacturer Part Number: z8f1621
• Description: High Performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Table 59. UART Baud Rate High Byte Register (UxBRH)
Table 60. UART Baud Rate Low Byte Register (UxBRL)
PS019921-0308
BITS
FIELD
RESET
R/W
ADDR
BITS
FIELD
RESET
R/W
ADDR
7
7
For a given UART data rate, the integer baud rate divisor value is calculated using the
following equation:
The baud rate error relative to the desired baud rate is calculated using the following
equation:
For reliable communication, the UART baud rate error must never exceed 5 percent.
Table 61
used crystal oscillator frequencies.
UART Baud Rate Divisor Value (BRG)
UART Baud Rate Error (%)
provides information on data rate errors for popular baud rates and commonly
6
6
5
5
=
100
F46H and F4EH
F47H and F4FH
4
4
×


BRH
R/W
BRL
R/W
Actual Data Rate Desired Data Rate
------------------------------------------------------------------------------------------ -
1
1
=
Round
3
3
Desired Data Rate


System Clock Frequency (Hz)
------------------------------------------------------------------------
16
×
Z8 Encore! XP
UART Data Rate (bits/s)
–
2
2
Product Specification
1
1
®
F64XX Series




0
0
UART
117