MC68F375BGMZP33 Freescale Semiconductor, MC68F375BGMZP33 Datasheet - Page 88

• Manufacturer Part Number: MC68F375BGMZP33
• Description: IC MPU 32BIT 33MHZ 217-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68F375BGMZP33

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 217-PBGA
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Program Memory Type: Flash
• Program Memory Size: 256 KB
• Data Ram Size: 10 KB
• Interface Type: SPI, SCI, CAN
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 16
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: No

4.3 System Clock
4.3.1 System Clock Sources
MC68F375
REFERENCE MANUAL
MODCLK
NOTES:
V
DDSYN
The system clock in the SCIM2E provides timing signals for IMB modules and the
external bus interface. MC68F375 MCUs are fully static MCU designs; register and
memory contents are not affected by clock rate changes. System hardware and soft-
ware support clock rate changes during operation.
The system clock signal can be generated from one of three sources. An internal
phase-locked loop (PLL) can synthesize the clock from either a slow or fast reference.
The clock signal can also be input directly from an external 2X frequency source.
The slow reference is typically a 32.768 KHz crystal; the fast reference is typically a
4 MHz crystal. The slow and fast references may be provided by sources other than a
crystal. Keep these clock sources in mind while reading the rest of this section.
The system clock source is determined upon RESET assertion by the state of the
V
source, these pins govern the functionality of the W, X, and Y bits in the synthesizer
control register (SYNCR) and the equation that determines the MCU operating fre-
quency.
information, see
1. In external clock mode, the FASTREF/PF0 pin has no effect on clock operation.
The parameter “f
EXTAL pin. The parameter “
0
1
1
DDSYN
/
FASTREF/
/MODCLK and FASTREF/PF0 pins. In addition to selecting the system clock
Table 4-5
The SCIM2E system clock is different from the SCIM. Do not refer to
SCIM documentation for SCIM2E clock information.
PF0
X
0
1
1
4.3.6 Clock Synthesizer Control
REF
Slow Reference
Fast Reference
SINGLE-CHIP INTEGRATION MODULE 2 (SCIM2E)
External Clock
Clock Mode
Freescale Semiconductor, Inc.
” refers to the frequency of the clock source connected to the
For More Information On This Product,
summarizes system clock source information. For more
Table 4-5 System Clock Sources
f
SYS
Go to: www.freescale.com
” refers to the operating frequency of the MCU and
Rev. 25 June 03
Y[5:0] = 0b11111 : Multiplier
W[2:0] = 0b011 : Multiplier
Y[2:0] = 0b000 : Divider
Y[2:0] = 0b111 : Divider
W = 0b0 : Multiplier
Assignments and
SYNCR W/X/Y Bit
W : has no effect
X = 0b0 : Divider
X = 0b0 : Divider
CAUTION
X=0b1 : Divider
Reset Values
Register.
f
sys
f
f
sys
sys
Frequency Equation
=
=
=
MCU Operating
4f
------------------------------ for Y
------------------------------, for Y 7
f
2 X
ref
ref
2 X
–
–
f
-------- -
ref
Y
W
2
+
+
2
2
1
Y
Y
1
MOTOROLA
2
2W
+
7
X
4-6