XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 315

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

MC68HC908AZ60A — Rev 2.0
MOTOROLA
SPR1 and SPR0 — SPI Baud Rate Select Bits
Use this formula to calculate the SPI baud rate:
where:
If the MODFEN bit is low, the level of the SS pin does not affect the
operation of an enabled SPI configured as a master. For an enabled
SPI configured as a slave, having MODFEN low only prevents the
MODF flag from being set. It does not affect any other part of SPI
operation. (See
In master mode, these read/write bits select one of four baud rates as
shown in
Reset clears SPR1 and SPR0.
CGMOUT = base clock output of the clock generator module (CGM),
see
BD = baud rate divisor
Clock Generator Module (CGM)
SPR1:SPR0
Baud rate
Serial Peripheral Interface (SPI)
Table
Table 19-6. SPI Master Baud Rate Selection
00
01
10
11
19-6. SPR1 and SPR0 have no effect in slave mode.
Mode Fault Error
=
CGMOUT
------------------------- -
2 BD
×
on page 299).
Baud Rate Divisor (BD)
on page 169.
Serial Peripheral Interface (SPI)
128
32
2
8
Technical Data
I/O Registers
315