MC908AZ32ACFU Freescale Semiconductor, MC908AZ32ACFU Datasheet - Page 95

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MC908AZ32ACFU

Manufacturer Part Number
MC908AZ32ACFU
Description
IC MCU 32K FLASH 8.4MHZ 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908AZ32ACFU

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
40
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 15x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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The PLL also can operate in manual mode (AUTO = 0). Manual mode is used by systems that do not
require an indicator of the lock condition for proper operation. Such systems typically operate well below
f
8.3.2.4 Programming the PLL
Use this 9-step procedure to program the PLL. The table below lists the variables used and their meaning
(Please also reference
Freescale Semiconductor
busmax
1. Choose the desired bus frequency, f
2. Calculate the desired VCO frequency, f
3. Using a reference frequency, f
ACQ is a writable control bit that controls the mode of the filter. Before turning on the PLL in manual
mode, the ACQ bit must be clear.
Before entering tracking mode (ACQ = 1), software must wait a given time, t
Electrical
(PCTL).
Software must wait a given time, t
clock source to CGMOUT (BCS = 1).
The LOCK bit is disabled.
CPU interrupts from the CGM are disabled.
Example: f
f
Example: f
multiplier, N. Round the result to the nearest integer.
VCLKDES
and require fast startup. The following conditions apply when in manual mode:
= 4 × f
Specifications), after turning on the PLL by setting PLLON in the PLL control register
BUSDES
VCLKDES
f
f
Variable
f
f
CGMRCLK
CGMVCLK
f
VCLKDES
CGMVRS
BUSDES
f
f
NOM
BUS
BUSDES
Figure
= 8 MHz
= 4 × 8 MHz = 32 MHz
8-1).
MC68HC908AZ32A Data Sheet, Rev. 2
Desired Bus Clock Frequency
Desired VCO Clock Frequency
Chosen Reference Crystal Frequency
Calculated VCO Clock Frequency
Calculated Bus Clock Frequency
Nominal VCO Center Frequency
Shifted VCO Center Frequency
Table 8-2. Variable Definitions
Example:
RCLK
al
N
, equal to the crystal frequency, calculate the VCO frequency
, after entering tracking mode before selecting the PLL as the
BUSDES
=
VCLKDES
-------------------------
f
f
N
CGMRCLK
VCLKDES
=
.
32 MHz
------------------- -
4 MHz
.
Definition
=
8
acq
Functional Description
(see
Chapter 25
95

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