MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 193

• 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

; ----------------------------------------------------------------------
;*
; ----------------------------------------------------------------------
INIT:
;
;
;
; ----------------------------------------------------------------------
;*
; ----------------------------------------------------------------------
TRANSMIT:
;
;
FLAG:
DONE:
; ----------------------------------------------------------------------
;
; ----------------------------------------------------------------------
DATA:
EOT:
Freescale Semiconductor
TABLE OF DATA TO BE TRANSMITTED
BSET
MOVB
MOVB
MOVB
MOVB
LDX
LDAA
LDAA
BSET
RTS
LDAA
BEQ
BCLR
STAA
BRCLR
BSET
BRA
RTS
DC.B
DC.B
DC.B
END
TRANSMIT SUBROUTINE
SUBROUTINE INIT:
PORTS,#$80
#$E0,DDRS
#$07,SP0BR
#$12,SP0CR1
#$08,SP0CR2
#DATA
SP0SR
SP0DR
SP0CR1,#$40
1,X+
DONE
PORTS,#$80
SP0DR
SP0SR,#$80,FLAG
PORTS,#$80
TRANSMIT
'Freescale'
$0D,$0A
$00
MC68HC812A4 Data Sheet, Rev. 7
; SET SS Line High to prevent glitch
; Configure PORT S input/ouput levels
; MOSI, SCK, SS* = ouput, MISO=Input
; Select serial clock baud rate < 100 KHz
; Configure SPI(SP0CR1): No SPI interrupts,
; MSTR=1, CPOL=0, CPHA=0
; Config. PORTS output drivers to operate normally,
; and with active pull-up devices.
; Use X register as pointer to first character
; 1st step to clear SPIF Flag, Read SP0SR
; 2nd step to clear SPIF Flag, Access SP0DR
; Enable the SPI (SPE=1)
; Return from subroutine
; Load Acc. with "NEW" character to send, Inc X
; Detect if last character(0) has been transmitted
; If last char. branch to DONE, else
; Assert SS Line to start X-misssion.
; Load Data into Data Reg.,X-mit.
; it is also the 2nd step to clear SPIF flag.
;Wait for flag.
; Disassert SS Line.
; Continue sending characters, Branch to TRANSMIT.
; Return from subroutine
; Return (cr) ,Line Feed (LF)
; Byte used to test end of data = EOT
; End of program
Synchronous Character Transmission Using the SPI
193