MC68HC711P2CFN4 Freescale Semiconductor, MC68HC711P2CFN4 Datasheet - Page 178

• Manufacturer Part Number: MC68HC711P2CFN4
• Description: IC MCU 32K OTP 4MHZ 84-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC11r

Specifications of MC68HC711P2CFN4

• Core Processor: HC11
• Core Size: 8-Bit
• Speed: 4MHz
• Connectivity: MI Bus, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 640 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 84-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Analog-to-Digital Converter
9.4 A/D converter power-up and clock select
9.4.1 OPTION — System configuration options register 1
Technical Data
System config. options 1
(OPTION)
An input voltage equal to V
to V
ratiometric conversions of this type, the source of each analog input
should use V
ADPU (bit 7 of the OPTION register) controls A/D converter power up.
Clearing ADPU removes power from and disables the A/D converter
system; setting ADPU enables the A/D converter system. After the A/D
converter is turned on, the analog bias voltages will take up to 100µs to
stabilize.
When the A/D converter system is operating from the MCU E clock, all
switching and comparator operations are synchronized to the MCU
clocks. This allows the comparator results to be sampled at ‘quiet’ times,
which minimizes noise errors. The internal RC oscillator is asynchronous
with respect to the MCU clock, so noise can affect the A/D converter
results. This results in a slightly lower typical accuracy when using the
internal oscillator (CSEL = 1).
The 8-bit special-purpose OPTION register sets internal system
configuration options during initialization. The time protected control bits,
IRQE, DLY, FCME and CR[1:0] can be written to only once in the first 64
cycles after a reset and then they become read-only bits. This minimizes
the possibility of any accidental changes to the system configuration.
They may be written at any time in special modes.
ADPU — A/D power-up
Freescale Semiconductor, Inc.
RH
Address bit 7
For More Information On This Product,
$0039 ADPU CSEL IRQE
1 = A/D system power enabled.
converts to $FF (full scale), with no overflow indication. For
Analog-to-Digital Converter
Go to: www.freescale.com
RH
as the supply voltage and be referenced to V
bit 6
bit 5
RL
converts to $00 and an input voltage equal
bit 4
DLY
CME FCME CR1
bit 3
bit 2
MC68HC11P2 — Rev 1.0
bit 1
CR0 0001 0000
bit 0
RL
.
on reset
State