MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 177

• 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

14.12.2 Code Listing
INCLUDE 'EQUATES.ASM'
; User Variables
; Bit Equates
; ----------------------------------------------------------------------
;
; ----------------------------------------------------------------------
;
MAIN:
DONE:
; ----------------------------------------------------------------------
;
; ----------------------------------------------------------------------
INIT:
;
; ----------------------------------------------------------------------
;
; ----------------------------------------------------------------------
TRANS: BRCLR
; ----------------------------------------------------------------------
;
; ----------------------------------------------------------------------
DATA:
EOT:
Freescale Semiconductor
TABLE : DATA TO BE TRANSMITTED
ORG
BSR
BSR
BRA
TPA
ORAA
TAP
MOVB
MOVB
MOVB
LDAA
STD
LDX
RTS
MOVB
CPX
BNE
RTS
DC.B
DC.B
DC.B
DC.B
DC.B
END
TRANSMIT SUBROUTINE
SUBROUTINE INIT:
A comment line is delimited by a semicolon. If there is no code before
comment, a semicolon (;) must be placed in the first column to avoid
assembly errors.
MAIN PROGRAM
$7000
INIT
TRANS
DONE
#$10
#$34,SC1BDL
#$00,SC1CR1
#$08,SC1CR2
SC1SR1
SC1DRH
#DATA
SC1SR1,#$80, TRANS ; Wait for TDRE flag
1,X+,SC1DRL
#EOT
TRANS
'Freescale HC12 Banner - June, 1999'
$0D,$0A
'Scottsdale, Arizona'
$0D,$0A
$04
; Equates for registers
MC68HC812A4 Data Sheet, Rev. 7
; 16K On-Board RAM, User code data area,
; start main program at $4000
; Subroutine to Initialize SCI0 registers
; Subroutine to start transmission
; Always branch to DONE, convenient for breakpoint
; Transfer CCR to A accumulator
; ORed A with #$10 to Set I bit
; Transfer A to CCR
; Set BAUD =9600, in SCI1 Baud Rate Reg.
; Initialize for 8-bit Data format,
; Loop Mode
; Set for No Ints, and Transmitter enabled(SC1CR2)
; 1st step to clear TDRE flag: Read SC1SR1
; 2nd step to clear TDRE flag: Write SC1DR register
; Use X as a pointer to DATA.
; Return from subroutine
; Transmit character, increment X pointer
; Detect if last character has been transmitted
; If last char. not equal to "eot", Branch to TRANS
; else Transmission complete, Return from Subroutine
; Return (cr) ,Line Feed (LF)
; Return (cr) ,Line Feed (LF)
; Byte used to test end of data = EOT
; End of program
NOTE
and parity disabled,(SC1CR1)
Serial Character Transmission Using the SCI
177