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MC68HC908GR4MP Datasheet(PDF) 184 Page - Freescale Semiconductor, Inc

Part # MC68HC908GR4MP
Description  M68HC08 Microcontrollers
PDF  286 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC908GR4MP Datasheet(HTML) 184 Page - Freescale Semiconductor, Inc

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Serial Communications Interface (SCI)
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
184
Freescale Semiconductor
SCP1 and SCP0 — SCI Baud Rate Prescaler Bits
These read/write bits select the baud rate prescaler divisor as shown in Table 18-6. Reset clears SCP1
and SCP0.
SCR2–SCR0 — SCI Baud Rate Select Bits
These read/write bits select the SCI baud rate divisor as shown in Table 18-7. Reset clears
SCR2–SCR0.
Use this formula to calculate the SCI baud rate:
where:
fBUS = bus frequency
PD = prescaler divisor
BD = baud rate divisor
SCIBDSRC from the configuration register is an input to the SCI. With SCIBDSRC = 1 to select the bus
clock as the clock source, this makes the formula:
Table 18-8 shows the SCI baud rates that can be generated with a 4.9152-MHz bus clock.
Table 18-6. SCI Baud Rate Prescaling
SCP1 and SCP0
Prescaler Divisor (PD)
00
1
01
3
10
4
11
13
Table 18-7. SCI Baud Rate Selection
SCR2, SCR1, and SCR0
Baud Rate Divisor (BD)
000
1
001
2
010
4
011
8
100
16
101
32
110
64
111
128
baud rate
f BUS
64
PD
BD
×
×
------------------------------------
=
baud rate
f BUS
64
PD
BD
×
×
------------------------------------
=



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