DEMO9S12XEP100 Freescale Semiconductor, DEMO9S12XEP100 Datasheet - Page 750

• Manufacturer Part Number: DEMO9S12XEP100
• Description: BOARD DEMO FOR MC9S12XEP100
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S12XEP100

• Contents: Board, Cables, CD
• Processor To Be Evaluated: MC9S12XEP100
• Data Bus Width: 16 bit
• Interface Type: RS-232
• Silicon Manufacturer: Freescale
• Core Architecture: S12
• Core Sub-architecture: S12
• Silicon Core Number: MC9S12
• Silicon Family Name: S12XE
• Rohs Compliant: Yes
• For Use With/related Products: MC9S12XEP100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 20 Serial Communication Interface (S12SCIV5)
20.4.6
20.4.6.1
The SCI receiver 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 receiving 9-bit data, bit R8 in
SCI data register high (SCIDRH) is the ninth bit (bit 8).
20.4.6.2
During an SCI reception, the receive shift register shifts a frame in from the RXD pin. The SCI data register
is the read-only buffer between the internal data bus and the receive shift register.
After a complete frame shifts into the receive shift register, the data portion of the frame transfers to the
SCI data register. The receive data register full flag, RDRF, in SCI status register 1 (SCISR1) becomes set,
750
From TXD Pin
or Transmitter
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
SCRXD
LOOPS
RSRC
Receiver
Receiver Character Length
Character Reception
RXPOL
Control
SBR12:SBR0
Loop
Clock
Bus
Baud Divider
MC9S12XE-Family Reference Manual , Rev. 1.23
Figure 20-20. SCI Receiver Block Diagram
WAKE
RAF
RE
ILT
PE
PT
M
Recovery
Detect Logic
Data
Detect Logic
Active Edge
Break
BRKDFE
Checking
Wakeup
Parity
Logic
Internal Bus
H
RXEDGIF
RXEDGIE
BRKDIE
BRKDIF
8
RDRF
11-Bit Receive Shift Register
7
OR
SCI Data Register
6
5
4
FE
NF
PE
3
R8
IDLE
Freescale Semiconductor
ILIE
RIE
2
Break IRQ
RX Active Edge IRQ
1
0
L
RWU
RDRF/OR
Idle IRQ
IRQ