MC68HC05C8A Datasheet, PDF (85/158 Pages) Motorola, Inc – Microcontrollers

Serial Communications Interface (SCI)
SCI Input/Output (I/O) Registers
SCR2–SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate, as shown in
Table 9-2. Reset has no effect on the SCR2–SCR0 bits.
Table 9-2. Baud Rate Selection
SCR2–SCR0
000
001
010
011
100
101
110
111
SCI Baud Rate (Baud)
Prescaled clock divided by 1
Prescaled clock divided by 2
Prescaled clock divided by 4
Prescaled clock divided by 8
Prescaled clock divided by 16
Prescaled clock divided by 32
Prescaled clock divided by 64
Prescaled clock divided by 128
Table 9-3 shows all possible SCI baud rates derived from crystal
frequencies of 2 MHz, 4 MHz, and 4.194304 MHz.
MC68HC05C8A • MC68HCL05C8A • MC68HSC05C8A — Rev. 5.0
MOTOROLA
Serial Communications Interface (SCI)
Technical Data
85