MC908QY2CDTER Freescale Semiconductor, MC908QY2CDTER Datasheet - Page 101
MC908QY2CDTER
Manufacturer Part Number
MC908QY2CDTER
Description
IC MCU 8BIT 1.5K FLASH 16TSSOP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908QY4MDWER.pdf
(184 pages)
Specifications of MC908QY2CDTER
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, PWM
Number Of I /o
13
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 4x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
16-TSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
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12.3.2 Data Direction Register B
Data direction register B (DDRB) determines whether each port B pin is an input or an output. Writing a 1
to a DDRB bit enables the output buffer for the corresponding port B pin; a 0 disables the output buffer.
DDRB[7:0] — Data Direction Register B Bits
When DDRBx is a 1, reading address $0001 reads the PTBx data latch. When DDRBx is a 0, reading
address $0001 reads the voltage level on the pin. The data latch can always be written, regardless of the
state of its data direction bit.
Freescale Semiconductor
These read/write bits control port B data direction. Reset clears DDRB[7:0], configuring all port B pins
as inputs.
1 = Corresponding port B pin configured as output
0 = Corresponding port B pin configured as input
Address: $0005
1. X = don’t care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect the input.
DDRB
Avoid glitches on port B pins by writing to the port B data register before
changing data direction register B bits from 0 to 1.
port B I/O logic.
Reset:
Read:
Write:
Bit
0
1
READ DDRB ($0005)
WRITE DDRB ($0005)
WRITE PTB ($0001)
READ PTB ($0001)
DDRB7
Bit 7
PTB
X
0
Bit
X
(1)
Figure 12-6. Data Direction Register B (DDRB)
Table 12-2
DDRB6
Input, Hi-Z
MC68HC908QY/QT Family Data Sheet, Rev. 6
6
0
I/O Pin
Output
RESET
Mode
Table 12-2. Port B Pin Functions
Figure 12-7. Port B I/O Circuit
DDRB5
(2)
summarizes the operation of the port B pins.
5
0
Accesses to DDRB
DDRB7–DDRB0
DDRB7–DDRB0
DDRBx
DDRB4
NOTE
PTBx
Read/Write
4
0
DDRB3
3
0
Figure 12-7
DDRB2
Read
2
0
Pin
Pin
PTBPUEx
Accesses to PTB
DDRB1
PTB7–PTB0
PTB7–PTB0
1
0
shows the
Write
30 k
DDRB0
Bit 0
PTBx
0
(3)
Port B
101
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