S912XEP768J5MAGR Freescale Semiconductor, S912XEP768J5MAGR Datasheet - Page 743
S912XEP768J5MAGR
Manufacturer Part Number
S912XEP768J5MAGR
Description
16-bit Microcontrollers - MCU 16-bit 768K Flash
Manufacturer
Freescale Semiconductor
Datasheet
1.S912XEG128J2MAL.pdf
(1324 pages)
Specifications of S912XEP768J5MAGR
Rohs
yes
Core
HCS12X
Processor Series
MC9S12
Data Bus Width
16 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
768 KB
Data Ram Size
48 KB
On-chip Adc
Yes
Operating Supply Voltage
3.3 V to 5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-144
Mounting Style
SMD/SMT
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
S912XEP768J5MAGR
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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20.4.5
20.4.5.1
The SCI transmitter can accommodate either 8-bit or 9-bit data characters. The state of the M bit in SCI
control register 1 (SCICR1) determines the length of data characters. When transmitting 9-bit data, bit T8
in SCI data register high (SCIDRH) is the ninth bit (bit 8).
20.4.5.2
To transmit data, the MCU writes the data bits to the SCI data registers (SCIDRH/SCIDRL), which in turn
are transferred to the transmitter shift register. The transmit shift register then shifts a frame out through
the TXD pin, after it has prefaced them with a start bit and appended them with a stop bit. The SCI data
registers (SCIDRH and SCIDRL) are the write-only buffers between the internal data bus and the transmit
shift register.
Freescale Semiconductor
TDRE IRQ
BER IRQ
TC IRQ
Clock
Bus
SBR12:SBR0
Transmitter
Transmitter Character Length
Character Transmission
Baud Divider
PE
PT
M
Generation
÷ 16
Parity
T8
MC9S12XE-Family Reference Manual Rev. 1.25
Figure 20-16. Transmitter Block Diagram
BERRIF
TDRE
TCIE
TCIE
TIE
TC
H
8
7
11-Bit Transmit Register
6
5
SCI Data Registers
4
Internal Bus
Transmitter Control
TE
3
2
Chapter 20 Serial Communication Interface (S12SCIV5)
Collision Detect
SBK
1
Transmit
0
BERRM[1:0]
L
TXPOL
CONTROL
LOOP
SCTXD
SCRXD
(From Receiver)
LOOPS
RSRC
To Receiver
SCTXD
743
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