MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 317

• Manufacturer Part Number: MC68HC908AB32CFU
• Description: IC MCU 8MHZ 32K FLASH 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AB32CFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM
• Number Of I /o: 51
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• 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: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MC68HC908AB32
Freescale Semiconductor
NOTE:
—
Rev. 1.1
DDRA[7:0] — Data Direction Register A Bits
Avoid glitches on port A pins by writing to the port A data register before
changing data direction register A bits from 0 to 1.
the port A I/O logic.
When DDRAx is a logic 1, reading address $0000 reads the PTAx data
latch. When DDRAx is a logic 0, reading address $0000 reads the
voltage level on the pin. The data latch can always be written, regardless
of the state of its data direction bit.
Table 17-2
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRA
These read/write bits control port A data direction. Reset clears
DDRA[7:0], configuring all port A pins as inputs.
Bit
0
1
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
PTA Bit
X
summarizes the operation of the port A pins.
X
(1)
Input/Output (I/O) Ports
Table 17-2. Port A Pin Functions
Input, Hi-Z
I/O Pin Mode
Figure 17-4. Port A I/O Circuit
RESET
Output
(2)
Accesses to DDRA
DDRAx
PTAx
DDRA[7:0]
DDRA[7:0]
Read/Write
PTA[7:0]
Figure 17-4
Input/Output (I/O) Ports
Read
Pin
Accesses to PTA
Technical Data
PTA[7:0]
PTA[7:0]
shows
Write
PTAx
317
(3)