w65c134s Western Design Center, Inc., w65c134s Datasheet - Page 13

• Manufacturer Part Number: w65c134s
• Description: W65c134s 8-bit Microcontroller
• Manufacturer: Western Design Center, Inc.

Note: Shading indicates transmitter or receiver error greater than 1.5%.
Baud Rate
Standard
1.9
Timer A provides clock timing for the Asynchronous I/O and establishes the data rate for the UART. Timer A
operates as configured by TCR1x (Timer Control Register One) and should be set up prior to enabling the
UART.
Table 1-2 identifies the values to be loaded into Timer A to select standard data rates. Although Table 1-2
identifies only the more common data rates, any data rate can be selected by using the formula:
Note:
19200
38400
1200
1800
2400
4800
9600
110
150
300
600
Asynchronous I/O Data Rate Generation (Timer A)
75
One may notice slight differences between the standard rate and the actual data rate. However,
transmitter and receiver error of 1.5% or less is acceptable.
1.8432MHz
$00BF
$05FF
$02FF
$000B
$017F
$005F
$003F
$002F
$0416
$0017
$0005
$0002
where N
N
PHI2 the clock frequency
bps
decimal value to be loaded in to Timer A using its hexadecimal equivalent
The desired data rate
=
Table 1-2 Timer A Values for Baud Rate Selection
2.000MHz
$01A0
$00CF
$000C
$046F
$0682
$0340
$0067
$0044
$0033
$0019
$0006
$0002
16 x bps
PHI2
---------
2.4576MHz
-
$07FF
$03FF
$01FF
$00FF
$007F
$003F
$001F
$000F
$0573
$0054
$0007
$0003
1
3.6864MHz
$0BFF
$00BF
$082E
$05FF
$02FF
$000B
$017F
$007F
$005F
$002F
$0017
$0005
4.000MHz
$0D04
$01A0
$00CF
$008A
$000C
$08E0
$0682
$0340
$0067
$0033
$0019
$0006
4.9152MHz
$00AA
$0AE8
$0FFF
$07FF
$03FF
$01FF
$00FF
$007F
$003F
$001F
$000F
$0007
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