MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 187
MC68HC908AP8CB
Manufacturer Part Number
MC68HC908AP8CB
Description
IC MCU 8K FLASH 8MHZ 42SDIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AP8CFBE.pdf
(324 pages)
Specifications of MC68HC908AP8CB
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, IRSCI, SCI, SPI
Peripherals
LED, LVD, POR, PWM
Number Of I /o
32
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
42-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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12.5.2.2 Character Transmission
During an SCI transmission, the transmit shift register shifts a character out to the TxD pin. The IRSCI
data register (IRSCDR) is the write-only buffer between the internal data bus and the transmit shift
register. To initiate an SCI transmission:
At the start of a transmission, transmitter control logic automatically loads the transmit shift register with
a preamble of logic 1s. After the preamble shifts out, control logic transfers the IRSCDR data into the
transmit shift register. A logic 0 start bit automatically goes into the least significant bit position of the
transmit shift register. A logic 1 stop bit goes into the most significant bit position.
Freescale Semiconductor
BUS CLOCK
CGMXCLK
1. Enable the SCI by writing a logic 1 to the enable SCI bit (ENSCI) in IRSCI control register 1
2. Enable the transmitter by writing a logic 1 to the transmitter enable bit (TE) in IRSCI control register
3. Clear the SCI transmitter empty bit by first reading IRSCI status register 1 (IRSCS1) and then
4. Repeat step 3 for each subsequent transmission.
(IRSCC1).
2 (IRSCC2).
writing to the IRSCDR.
SL = 0 => X = A
SL = 1 => X = B
A
B
CKS
SL
X
SCP1
SCP0
SCR1
SCR2
SCR0
SCALER
PRE-
MC68HC908AP Family Data Sheet, Rev. 4
DIVIDER
BAUD
Figure 12-7. SCI Transmitter
PEN
PTY
÷ 16
GENERATION
PARITY
DMATE
DMATE
SCTIE
SCTE
DMATE
SCTE
SCTIE
TC
TCIE
T8
M
H
8
SCTIE
7
SCTE
TCIE
TC
SCI DATA REGISTER
6
SHIFT REGISTER
INTERNAL BUS
TRANSMIT
5
11-BIT
4
CONTROL LOGIC
TRANSMITTER
3
2
1
SCI Functional Description
LOOPS
ENSCI
SBK
TE
0
L
SCI_TxD
187
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