MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 154

• Manufacturer Part Number: MC68HC908GR8CD
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908GR8CD

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 384 B
• Operating Supply Voltage: 3 V to 5 V
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Data Rom Size: 64 KB
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 21
• Program Memory Type: Flash

Input/Output Ports (I/O)
Figure 16-15
When bit DDRDx is a 1, reading address $0003 reads the PTDx data latch. When bit DDRDx is a 0,
reading address $0003 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
154
PTDPUE Bit
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
4. I/O pin pulled up to V
X
1
0
shows the port D I/O logic.
DDRD Bit
0
0
1
READ DDRD ($0007)
WRITE DDRD ($0007)
WRITE PTD ($0003)
READ PTD ($0003)
DD
by internal pullup device.
PTD Bit
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
X
X
X
(1)
Table 16-5. Port D Pin Functions
RESET
Figure 16-15. Port D I/O Circuit
I/O Pin Mode
Input, Hi-Z
Input, V
Output
DD
Table 16-5
(4)
(2)
DDRDx
PTDx
Accesses to DDRD
DDRD6–DDRD0
DDRD6–DDRD0
DDRD6–DDRD0
Read/Write
summarizes the operation of the port D pins.
PTDPUEx
PTD6–PTD0
Read
Pin
Pin
V
Accesses to PTD
DD
Freescale Semiconductor
INTERNAL
PULLUP
DEVICE
PTDx
PTD6–PTD0
PTD6–PTD0
PTD6–PTD0
Write
(3)
(3)