XC68HC705B32CFN Freescale Semiconductor, XC68HC705B32CFN Datasheet - Page 100

• Manufacturer Part Number: XC68HC705B32CFN
• Description: IC MCU 2.1MHZ 32K OTP 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of XC68HC705B32CFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Eeprom Size: 256 x 8
• Ram Size: 528 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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