Datasheet

Serial Peripheral Interface (SPI)
MC68HC812A4 Data Sheet, Rev. 7
188 Freescale Semiconductor
15.6.3 SPI Baud Rate Register
Read: Anytime
Write: Anytime
SPR2–SPR0 — SPI Clock Rate Select Bits
These bits select one of eight SPI baud rates as shown in Table 15-3. Reset clears SPR2–SPR0,
selecting E-clock divided by two.
Address: $00D2
Bit 7654321Bit 0
Read:00000
SPR2 SPR1 SPR0
Write:
Reset:00000000
= Unimplemented
Figure 15-11. SPI Baud Rate Register (SP0BR)
Table 15-3. SPI Clock Rate Selection
SPR[2:1:0]
E-Clock
Divisor
Baud Rate
(E-Clock = 4 MHz)
Baud Rate
(E-Clock = 8 MHz)
000 2 2.0 MHz 4.0 MHz
001 4 1.0 MHz 2.0 MHz
010 8 500 kHz 1.0 MHz
011 16 250 kHz 500 kHz
100 32 125 kHz 250 kHz
101 64 62.5 kHz 125 kHz
110 128 31.3 kHz 62.5 kHz
111 256 15.6 kHz 31.3 kHz