MC812A4CPVE8 Freescale Semiconductor, MC812A4CPVE8 Datasheet - Page 55

• 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

Chapter 5
Operating Modes and Resource Mapping
5.1 Introduction
The MCU can operate in eight different modes. Each mode has a different default memory map and
external bus configuration. After reset, most system resources can be mapped to other addresses by
writing to the appropriate control registers.
5.2 Operating Modes
The states of the BKGD, MODB, and MODA pins during reset determine the operating mode after reset.
The SMODN, MODB, and MODA bits in the MODE register show the current operating mode and provide
limited mode switching during operation. The states of the BKGD, MODB, and MODA pins are latched
into these bits on the rising edge of the reset signal.
The two basic types of operating modes are:
A system development and debug feature, background debug mode (BDM), is available in all modes. In
special single-chip mode, BDM is active immediately after reset.
5.2.1 Normal Operating Modes
These modes provide three operating configurations. Background debugging is available in all three
modes, but must first be enabled for some operations by means of a BDM command. BDM can then be
made active by another BDM command.
Freescale Semiconductor
•
•
Normal modes — Some registers and bits are protected against accidental changes.
Special modes — Protected control registers and bits are allowed greater access for special
purposes such as testing and emulation.
BKGD
1. G.P. = General purpose
0
0
0
0
1
1
1
1
MODB
0
0
1
1
0
0
1
1
MODA
0
1
0
1
0
1
0
1
Reserved (forced to peripheral)
MC68HC812A4 Data Sheet, Rev. 7
Table 5-1. Mode Selection
Special expanded narrow
Normal expanded narrow
Special expanded wide
Normal expanded wide
Special single-chip
Normal single chip
Special peripheral
Mode
G.P.
G.P. I/O
Port A
Port B
ADDR
ADDR
ADDR
ADDR
ADDR
—
(1)
I/O
G.P. I/O
G.P. I/O
Port C
DATA
DATA
DATA
DATA
DATA
—
G.P. I/O
G.P. I/O
G.P. I/O
G.P. I/O
Port D
DATA
DATA
DATA
—
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