MC912DG128ACPV Freescale Semiconductor, MC912DG128ACPV Datasheet - Page 103

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MC912DG128ACPV

Manufacturer Part Number
MC912DG128ACPV
Description
IC MCU 128K FLASH 8MHZ 112-LQFP
Manufacturer
Freescale Semiconductor
Series
HC12r
Datasheet

Specifications of MC912DG128ACPV

Core Processor
CPU12
Core Size
16-Bit
Speed
8MHz
Connectivity
CAN, I²C, SCI, SPI
Peripherals
POR, PWM, WDT
Number Of I /o
69
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 16x8/10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
112-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Technical Data — MC68HC912DT128A
7.1 Contents
7.2 Introduction
7.3 Detecting Access Type from External Signals
MC68HC912DT128A — Rev 4.0
MOTOROLA
7.2
7.3
7.4
Internally the MC68HC912DT128A has full 16-bit data paths, but
depending upon the operating mode and control registers, the external
multiplexed bus may be 8 or 16 bits. There are cases where 8-bit and
16-bit accesses can appear on adjacent cycles using the LSTRB signal
to indicate 8- or 16-bit data.
It is possible to have a mix of 8 and 16 bit peripherals attached to the
external multiplexed bus, using the NDRF bit in the MISC register while
in expanded wide modes.
The external signals LSTRB, R/W, and A0 can be used to determine the
type of bus access that is taking place. Accesses to the internal RAM
module are the only type of access that produce LSTRB = A0 = 1,
because the internal RAM is specifically designed to allow misaligned
16-bit accesses in a single cycle. In these cases the data for the address
that was accessed is on the low half of the data bus and the data for
address + 1 is on the high half of the data bus.
Freescale Semiconductor, Inc.
For More Information On This Product,
Section 7. Bus Control and Input/Output
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Detecting Access Type from External Signals . . . . . . . . . . . .103
Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
Bus Control and Input/Output
Go to: www.freescale.com
Technical Data
103

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