MC68HC16Z1CFC16 Freescale Semiconductor, MC68HC16Z1CFC16 Datasheet - Page 251

• Manufacturer Part Number: MC68HC16Z1CFC16
• Description: IC MPU 1K RAM 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: HC16r

Specifications of MC68HC16Z1CFC16

• Core Processor: CPU16
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 132-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

10.3.5 SPI Serial Clock Baud Rate
10.3.6 Wired-OR Open-Drain Outputs
10.3.7 Transfer Size and Direction
M68HC16 Z SERIES
USER’S MANUAL
Baud rate is selected by writing a value from two to 255 into SPBR[7:0] in the SPCR
of the master MCU. Writing an SPBR[7:0] value into the SPCR of the slave device has
no effect. The SPI uses a modulus counter to derive SCK baud rate from the MCU sys-
tem clock.
The following expressions apply to SCK baud rate:
Giving SPBR[7:0] a value of zero or one disables the baud rate generator. SCK is dis-
abled and assumes its inactive state value.
SPBR[7:0] has 254 active values.
the corresponding SCK frequency based on a 16.78-MHz system clock.
Typically, SPI bus outputs are not open-drain unless multiple SPI masters are in the
system. If needed, the WOMP bit in SPCR can be set to provide wired-OR, open-drain
outputs. An external pull-up resistor should be used on each output line. WOMP af-
fects all SPI pins regardless of whether they are assigned to the SPI or used as gen-
eral-purpose I/O.
The SIZE bit in the SPCR selects a transfer size of eight (SIZE = 0) or sixteen (SIZE
= 1) bits. The LSBF bit in the SPCR determines whether serial shifting to and from the
data register begins with the LSB (LSBF = 1) or MSB (LSBF = 0).
System Clock
Frequency
16.78 MHz
MULTICHANNEL COMMUNICATION INTERFACE
Freescale Semiconductor, Inc.
For More Information On This Product,
SPBR[7:0]
Required Division
Table 10-4 SCK Frequencies
SCK Baud Rate
Ratio
Go to: www.freescale.com
168
510
16
34
4
8
=
Table 10-4
------------------------------------------------------------------------- -
2 SCK Baud Rate Desired
Value of SPBR Actual SCK Frequency
or
=
255
17
84
2
4
8
lists several possible baud values and
------------------------------------ -
2 SPBR[7:0]
f
sys
f
sys
4.19 MHz
2.10 MHz
1.05 MHz
493 kHz
100 kHz
33 kHz
10-11