MC68HC908GR16CFJ Freescale Semiconductor, MC68HC908GR16CFJ Datasheet - Page 134
MC68HC908GR16CFJ
Manufacturer Part Number
MC68HC908GR16CFJ
Description
IC MCU 16K FLASH 8MHZ SPI 32LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC68908GR16CFJE.pdf
(276 pages)
Specifications of MC68HC908GR16CFJ
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
LIN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
21
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
MC68HC908GR16CFJ
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Input/Output Ports (PORTS)
12.6.2 Data Direction Register E
Data direction register E (DDRE) determines whether each port E pin is an input or an output. Writing a 1
to a DDRE bit enables the output buffer for the corresponding port E pin; a 0 disables the output buffer.
DDRE5–DDRE0 — Data Direction Register E Bits
Figure 12-19
When bit DDREx is a 1, reading address $0008 reads the PTEx data latch. When bit DDREx is a 0,
reading address $0008 reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
134
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
DDRE
These read/write bits control port E data direction. Reset clears DDRE5–DDRE0, configuring all port
E pins as inputs.
Bit
0
1
1 = Corresponding port E pin configured as output
0 = Corresponding port E pin configured as input
shows the port E I/O logic.
PTE
X
Address:
Bit
Avoid glitches on port E pins by writing to the port E data register before
changing data direction register E bits from 0 to 1.
X
(1)
Reset:
Read:
Write:
READ DDRE ($000C)
WRITE DDRE ($000C)
WRITE PTE ($0008)
READ PTE ($0008)
$000C
Bit 7
Input, Hi-Z
0
0
I/O Pin
Output
Mode
Figure 12-18. Data Direction Register E (DDRE)
= Unimplemented
(2)
6
0
0
Table 12-6. Port E Pin Functions
RESET
MC68HC908GR16 Data Sheet, Rev. 5.0
Figure 12-19. Port E I/O Circuit
DDRE5
5
0
Accesses to DDRE
DDRE5–DDRE0
DDRE5–DDRE0
Table 12-6
Read/Write
NOTE
DDRE4
DDREx
PTEx
4
0
summarizes the operation of the port E pins.
DDRE3
3
0
DDRE2
PTE5–PTE0
2
0
Read
Pin
DDRE1
Accesses to PTE
1
0
Freescale Semiconductor
DDRE0
Bit 0
PTEx
0
PTE5–PTE0
PTE5–PTE0
Write
(3)
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