MC68HC908GP16CFB Freescale Semiconductor, MC68HC908GP16CFB Datasheet - Page 116

• Manufacturer Part Number: MC68HC908GP16CFB
• Description: MCU 8-BIT 16K FLASH 44-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GP16CFB

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 33
• Program Memory Size: 16KB (16K 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 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Input/Output (I/O) Ports (PORTS)
DDRA[6:0] — Data Direction Register A Bits
Figure 12-3
When bit DDRAx is a 1, reading address $0000 reads the PTAx data latch. When bit DDRAx is a 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.
116
These read/write bits control port A data direction. Reset clears DDRA[6:0], configuring all port A pins
as inputs.
1 = Corresponding port A pin configured as output
0 = Corresponding port A pin configured as input
shows the port A I/O logic.
X = don’t care
Hi-Z = high impedance
1. Writing affects data register, but does not affect input.
Address:
DDRA
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.
Bit
Reset:
Read:
Write:
0
1
READ DDRA ($0004)
WRITE DDRA ($0004)
WRITE PTA ($0000)
READ PTA ($0000)
$0004
Bit 7
PTA
Bit
0
0
X
X
Figure 12-2. Data Direction Register A (DDRA)
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
= Unimplemented
DDRA6
Input, Hi-Z
I/O Pin
Output
6
0
Mode
Table 12-1. Port A Pin Functions
RESET
Figure 12-3. Port A I/O Circuit
DDRA5
5
0
Table 12-1
Accesses to DDRA
DDRA4
NOTE
DDRAx
Read/Write
DDRA[6:0]
DDRA[6:0]
PTAx
4
0
DDRA3
summarizes the operation of the port A pins.
3
0
DDRA2
2
0
PTA[6:0]
Read
Pin
Accesses to PTA
DDRA1
1
0
PTA[6:0]
PTA[6:0]
Freescale Semiconductor
Write
DDRA0
Bit 0
0
PTAx
(1)