MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 209

• Manufacturer Part Number: MC812A4CPVE8
• Description: IC MCU 16BIT EEPROM 4K 112-LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC12r

Specifications of MC812A4CPVE8

• Core Processor: CPU12
• Core Size: 16-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 83
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: EEPROM
• 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: 112-LQFP
• Processor Series: HC812A
• Core: HC12
• Data Bus Width: 16 bit
• Data Ram Size: 1 KB
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 91
• Number Of Timers: 8
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 8 Channel
• Controller Family/series: 68HC12
• No. Of I/o's: 91
• Eeprom Memory Size: 4KB
• Ram Memory Size: 1KB
• Cpu Speed: 8MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

; ----------------------------------------------
;
; ----------------------------------------------
; Set-up ATD, make single conversion and store the result to a memory location.
; Configure and start A/D conversion
; Analog Input Signal: On PORT AD6
; Convert: using single channel, non-continuous
; The result will be located in ADR2H
CONVERT:
;
;
WTCONV:
;
;* -------------------------------
;*
;* -------------------------------
; Delay Required for ATD converter to Stabilize (100 uSec)
DELAY:
Freescale Semiconductor
Subroutine DELAY 100 uS
LDAA
STAA
BRCLR
LDD
BRA
RTS
LDAA
DECA
BNE
RTS
END
Subroutine CONVERT:
#$06
ATDCTL5
ATDSTATH,#$80,WTCONV; Wait for Sequence Complete Flag
ADR2H
CONVERT
#$C8
DELAY
MC68HC812A4 Data Sheet, Rev. 7
; Initializes ATD SCAN=0,MULT=0, PAD6,
; Write Clears Flag
; 4 conversions on a Single Conversion
; sequence,
; Loads conversion result(ADR2H)
; into Accumulator
; Continuously updates results
; Return from subroutine
; Load Accumulator with "100 uSec delay value"
; Decrement ACC
; Branch if not equal to Zero
; Return from subroutine
; End of program
*
;
Using the ATD to Measure a Potentiometer Signal
209