Memory Addr | Freescale Semiconductor MC68HC908MR32, MC68HC908MR16

Memory
Addr.	Register Name
	Port A Data Register	Read:
	Port A Data Register
$0000	(PTA)	Write:
	See page 103.	Reset:
		Reset:
	Port B Data Register	Read:
	Port B Data Register
$0001	(PTB)	Write:
	See page 104.	Reset:
		Reset:
	Port C Data Register	Read:
	Port C Data Register
$0002	(PTC)	Write:
	See page 106.	Reset:
		Reset:
	Port D Data Register	Read:
	Port D Data Register
$0003	(PTD)	Write:
	See page 107.	Reset:
		Reset:
	Data Direction Register A	Read:
	Data Direction Register A
$0004	(DDRA)	Write:
	See page 103.	Reset:
		Reset:
	Data Direction Register B	Read:
	Data Direction Register B
$0005	(DDRB)	Write:
	See page 105.	Reset:
		Reset:
	Data Direction Register C	Read:
	Data Direction Register C
$0006	(DDRC)	Write:
	See page 106.	Reset:
		Reset:
$0007	Unimplemented

Bit 7	6	5	4	3	2	1	Bit 0
PTA7	PTA6	PTA5	PTA4	PTA3	PTA2	PTA1	PTA0

			Unaffected by reset

PTB7	PTB6	PTB5	PTB4	PTB3	PTB2	PTB1	PTB0

			Unaffected by reset

0	PTC6	PTC5	PTC4	PTC3	PTC2	PTC1	PTC0

R
R

			Unaffected by reset

0	PTD6	PTD5	PTD4	PTD3	PTD2	PTD1	PTD0

R	R	R	R	R	R	R	R

			Unaffected by reset

DDRA7	DDRA6	DDRA5	DDRA4	DDRA3	DDRA2	DDRA1	DDRA0

0	0	0	0	0	0	0	0

DDRB7	DDRB6	DDRB5	DDRB4	DDRB3	DDRB2	DDRB1	DDRB0

0	0	0	0	0	0	0	0

0	DDRC6	DDRC5	DDRC4	DDRC3	DDRC2	DDRC1	DDRC0

R
R

0	0	0	0	0	0	0	0

	Port E Data Register	Read:
	Port E Data Register
$0008	(PTE)	Write:
	See page 108.	Reset:
		Reset:
	Port F Data Register	Read:
	Port F Data Register
$0009	(PTF)	Write:
	See page 110.	Reset:
		Reset:
$000A	Unimplemented

PTE7	PTE6	PTE5	PTE4	PTE3	PTE2	PTE1	PTE0

			Unaffected by reset

0	0	PTF5	PTF4	PTF3	PTF2	PTF1	PTF0

R	R
R	R

Unaffected by reset

$000B	Unimplemented
	Data Direction Register E	Read:
	Data Direction Register E
$000C	(DDRE)	Write:
	See page 109.	Reset:
		Reset:
	Data Direction Register F	Read:
	Data Direction Register F
$000D	(DDRF)	Write:
	See page 110.	Reset:
		Reset:
U = Unaffected	X = Indeterminate

DDRE7	DDRE6	DDRE5	DDRE4	DDRE3	DDRE2	DDRE1	DDRE0

0	0	0	0	0	0	0	0

0	0	DDRF5	DDRF4	DDRF3	DDRF2	DDRF1	DDRF0

R	R
R	R

		0	0	0	0	0	0

R	= Reserved		Bold	= Buffered		= Unimplemented

Figure 2-2. Control, Status, and Data Registers Summary (Sheet 1 of 8)

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

28	Freescale Semiconductor

MC68HC908MR16, MC68HC908MR32 specifications

Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are part of the popular HC08 family, designed primarily for embedded applications. These microcontrollers are particularly favored in automotive, industrial, and consumer product sectors due to their reliability and versatility.

One of the standout features of the MC68HC908MR series is its CMOS technology, which enhances performance while minimizing power consumption. This makes these microcontrollers suitable for battery-operated devices. They operate at a maximum clock frequency of 2 MHz and offer a 16-bit architecture, providing a solid balance between processing power and efficiency.

The MC68HC908MR32 variant is equipped with 32KB of flash memory, which allows for the storage of complex programs and extensive data handling. In contrast, the MC68HC908MR16 features 16KB of flash memory, making it ideal for simpler applications. Both microcontrollers also come with 1KB of RAM, enabling efficient data processing and real-time operations.

Another significant characteristic of these microcontrollers is their integrated peripherals. They come with multiple input/output (I/O) pins, which allow for connectivity with various sensors and actuators. The built-in timer systems offer precise timing control for automotive and industrial applications, while the Analog-to-Digital Converter (ADC) provides essential conversion capabilities for various analog signals.

For communication purposes, the MC68HC908MR series includes a serial communication interface, enabling easy integration with other devices and systems. This versatility facilitates the development of complex systems that require interaction with external components.

Security is another crucial aspect of these microcontrollers. They have built-in fail-safe mechanisms to ensure reliable operation under various conditions, making them suitable for critical systems. Additionally, their robust architecture helps to safeguard against potential disruptions or attacks.

In summary, Freescale Semiconductor's MC68HC908MR32 and MC68HC908MR16 microcontrollers are key players in the embedded systems landscape. Their blend of power efficiency, integrated features, and scalability ensures they remain relevant for a wide array of applications, making them a favored choice among engineers and developers looking for dependable solutions in a competitive market.

Freescale Semiconductor MC68HC908MR32 manual Control, Status, and Data Registers Summary Sheet 1

Models: MC68HC908MR16 MC68HC908MR32

Memory

Addr.

(DDRC)

$0007

Unimplemented

Figure 2-2. Control, Status, and Data Registers Summary (Sheet 1 of 8)

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

MC68HC908MR16, MC68HC908MR32 specifications