MC68HC705MC4 Datasheet, PDF (87/99 Pages) Motorola, Inc – Microcontrollers

MC68HC705MC4 Specification Rev. 1.5
10.5.5 Baud Rate Register (BAUD)
The baud rate register selectes the baud rate for both the receiver and the transmitter.
7
6
5
4
3
2
SPDR ^READ:
$000A _WRITE:
SCP1 5 SCP0
SCR2
RESET: —
—
0
0
—
U
U = UNAFFECTED
Figure 10-8: Baud Rate Register (BAUD)
1
SCR1
U
0
SCR0
U
SCP1 and SCP0 — SCI Prescaler Select Bits
These read/write bits control prescaling of the baud rate generator clock, as
shown in Table 10-1:. Resets clear both SCP1 and SCP0.
Table 10-1: Baud Rate Generator Clock Prescaling
SCP[0:1]
00
01
10
11
Baud Rate Generator Clock
Internal Clock 1
Internal Clock 3
Internal Clock 4
Internal Clock 13
SCR2–SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate, as shown in Table 10-2: Baud
Rate Selection. Reset has no effect on the SCR2–SCR0 bits.
MOTOROLA
Page 78
Section 10: Serial Communications Interface