MC68HC908SR12CFA Freescale Semiconductor, MC68HC908SR12CFA Datasheet - Page 322

• Manufacturer Part Number: MC68HC908SR12CFA
• Description: MICROCONTROLLER 48 PIN
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908SR12CFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, Temp Sensor
• Number Of I /o: 31
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: Q1145673

Input/Output (I/O) Ports
Data Sheet
322
NOTE:
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 18-2
Notes:
1. X = don’t care.
2. Hi-Z = high impedance.
3. Writing affects data register, but does not affect input.
DDRA
Bit
0
1
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 18-2. Port A Pin Functions
Input, Hi-Z
I/O Pin Mode
Figure 18-4. Port A I/O Circuit
RESET
Output
(2)
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Accesses to DDRA
DDRAx
PTAx
DDRA[7:0]
DDRA[7:0]
Read/Write
Freescale Semiconductor
PTA[7:0]
Figure 18-4
Read
Pin
Accesses to PTA
PTA[7:0]
PTA[7:0]
shows
Write
PTAx
(3)