MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 208

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

8-26
MOTOROLA
QCLK EXAMPLES
Figure 8-9 and Table 8-4 show examples of QCLK programmability. The examples
include conversion times based on the following assumptions:
Figure 8-9 and Table 8-4 also show the conversion time calculated for a single con-
version in a queue. For other MCU system clock frequencies and other input sample
times, the same calculations can be made.
SYSTEM CLOCK
6. Calculate the QCLK frequency (f
7. Choose the number of input sample cycles (2, 4, 8, or 16) for a typical input
8. If the calculated conversion times are not sufficient, return to step 3. Conversion
9. Code the selected PSH, PSL, and PSA values into the prescaler fields of
• f
• Input sample time is as fast as possible (IST[1:0] = %00, 2 QCLK cycles).
sys
channel.
time is determined by the following equation:
QACR0.
EX1
EX2
= 20.97 MHz.
f
sys
Conversion time (in s
Figure 8-9 QADC Clock Programmability Examples
QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE
---------------------------------------------------------------------------------------------------------------------------- -
QCLK high time (in ns)
f
QCLK
=
16 CYCLES
(in MHz)
QCLK
16
---------------------------------------------------------------------------------------------- -
+
).
+
Number of input sample cycles
QCLK low time (in ns)
=
1000
f
QCLK
(in MHz)
USER’S MANUAL
MC68336/376
QADC QCLK EX