MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 217

• 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

17.4 BDM Registers
Seven BDM registers are mapped into the standard 64-Kbyte address space when BDM is active. The
registers can be accessed with the hardware READ_BD and WRITE_BD commands, but must not be
written during BDM operation. Most users are only interested in the STATUS register at $FF01; other
registers are for use only by BDM firmware and logic.
The instruction register is discussed for two conditions:
17.4.1 BDM Instruction Register
This section describes the BDM instruction register under hardware command and firmware command.
17.4.1.1 Hardware Command
The bits in the BDM instruction register have the following meanings when a hardware command is
executed.
H/F — Hardware/Firmware Flag
DATA — Data Flag
R/W — Read/Write Flag
BKGND — Hardware Request Bit to Enter Active Background Mode
W/B — Word/Byte Transfer Flag
BD/U — BDM Map/User Map Flag
Freescale Semiconductor
•
•
Indicates whether BDM registers and ROM are mapped to addresses $FF00 to $FFFF in the standard
64-Kbyte address space. Used only by hardware read/write commands.
1 = Hardware instruction
0 = Firmware instruction
1 = Data included in command
0 = No data
0 = Write
1 = Read
1 = Hardware background command (INSTRUCTION = $90)
0 = Not a hardware background command
1 = Word transfer
0 = Byte transfer
1 = BDM resources in map
0 = BDM resources not in map
When a hardware command is executed
When a firmware command is executed
Address: $FF00
Reset:
Read:
Write:
Bit 7
Figure 17-4. BDM Instruction Register (INSTRUCTION)
H/F
0
DATA
6
0
MC68HC812A4 Data Sheet, Rev. 7
R/W
5
0
BKGND
4
0
W/B
3
0
BD/U
2
0
1
0
0
Bit 0
0
0
BDM Registers
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