MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 175

• 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

14.7 External Pin Descriptions
This section provides a description of TXD and RXD, the SCI’s two external pins.
14.7.1 TXD Pin
TXD is the SCI transmitter pin. TXD is available for general-purpose I/O when it is not configured for
transmitter operation.
14.7.2 RXD Pin
RXD is the SCI receiver pin. RXD is available for general-purpose I/O when it is not configured for receiver
operation.
14.8 Modes of Operation
The SCI functions the same in normal, special, and emulation modes.
14.9 Low-Power Options
This section provides a description of the three low-power modes:
14.9.1 Run Mode
Clearing the transmitter enable or receiver enable bits (TE or RE) in SCI control register 2 (SCCR2)
reduces power consumption in run mode. SCI registers are still accessible when TE or RE is cleared, but
clocks to the core of the SCI are disabled.
14.9.2 Wait Mode
The SCI remains active in wait mode. Any enabled interrupt request from the SCI can bring the MCU out
of wait mode.
If SCI functions are not required during wait mode, reduce power consumption by disabling the SCI before
executing the WAIT instruction.
14.9.3 Stop Mode
For reduced power consumption, the SCI is inactive in stop mode. The STOP instruction does not affect
SCI register states. SCI operation resumes after an external interrupt.
Exiting stop mode by reset aborts any transmission or reception in progress and resets the SCI.
Freescale Semiconductor
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Run mode
Wait mode
Stop mode
MC68HC812A4 Data Sheet, Rev. 7
External Pin Descriptions
175