MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 102

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MC68HC705B16CFN

Manufacturer Part Number
MC68HC705B16CFN
Description
IC MCU 2.1MHZ 15K OTP 52-PLCC
Manufacturer
Freescale Semiconductor
Series
HC05r
Datasheet

Specifications of MC68HC705B16CFN

Core Processor
HC05
Core Size
8-Bit
Speed
2.1MHz
Connectivity
SCI
Peripherals
POR, WDT
Number Of I /o
32
Program Memory Size
15KB (15K x 8)
Program Memory Type
OTP
Eeprom Size
256 x 8
Ram Size
352 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
52-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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8
8.2.3
COCO — Conversion complete flag
Reset clears the COCO flag.
ADRC — A/D RC oscillator control
The ADRC bit allows the user to control the A/D RC oscillator, which is used to provide a
sufficiently high clock rate to the A/D to ensure accuracy when the chip is running at low speeds.
When the A/D RC oscillator is turned on, it takes a time t
Table
Note:
Power-on or external reset clears the ADRC bit.
Freescale
8-4
A/D status/control (ADSTAT)
11-7). During this time A/D conversion results may be inaccurate.
1 (set)
0 (clear) –
1 (set)
0 (clear) –
If the MCU bus clock falls below 1MHz, the A/D RC oscillator should be switched on.
A/D status/control register (ADSTAT)
ADRC
0
0
1
1
COCO is set each time a conversion is complete, allowing the new
result to be read from the A/D result data register ($08). The
converter then starts a new conversion.
COCO is cleared by reading the result data register or writing to the
status/control register.
When the ADRC bit is set, the A/D RC oscillator is turned on and, if
ADON is set, the A/D runs from the RC oscillator clock. See
When the ADRC bit is cleared, the A/D RC oscillator is turned-off
and, if ADON is set, the A/D runs from the CPU clock.
ADON
Address
ANALOG TO DIGITAL CONVERTER
0
1
0
1
$0009
Table 8-1 A/D clock selection
oscillator
COCO ADRC ADON
bit 7
OFF
OFF
RC
ON
ON
bit 6
converter
OFF
OFF
A/D
ON
ON
bit 5
A/D using RC oscillator clock.
A/D switched off.
A/D using CPU clock.
Allows the RC oscillator to stabilize.
bit 4
0
ADRC
Comments
CH3
bit 3
to stabilize (see
bit 2
CH2
CH1
bit 1
Table
Table 11-6
MC68HC05B6
bit 0
CH0
8-1.
0000 0000
Rev. 4.1
on reset
State
and

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