MC68HC705B16CFN Freescale Semiconductor, MC68HC705B16CFN Datasheet - Page 100

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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
The A/D reference input (AN0–AN7) is applied to a precision internal D/A converter. Control logic
drives this D/A converter and the analog output is successively compared with the analog input
sampled at the beginning of the conversion. The conversion is monotonic with no missing codes.
The result of each successive comparison is stored in the SAR and, when the conversion is
complete, the contents of the SAR are transferred to the read-only result data register ($08), and
the conversion complete flag, COCO, is set in the A/D status/control register ($09).
Warning: Any write to the A/D status/control register will abort the current conversion, reset the
At power-on or external reset, both the ADRC and ADON bits are cleared; thus the A/D is disabled.
Freescale
8-2
(VRH+VRL)/2
VRH
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
VRL
conversion complete flag and start a new conversion on the selected channel.
Figure 8-1 A/D converter block diagram
ANALOG TO DIGITAL CONVERTER
A/D result register (ADDATA) $08
Result
Successive approximation
register (SAR) and control
with sample and hold
8-bit capacitive DAC
A/D status/control register (ADSTAT)$09
CH0
CH1
CH2
CH3
0
ADON
VRH
VRL
MC68HC05B6
ADRC
Rev. 4.1
COCO

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