S912XEG128J2VAL
| Model | S912XEG128J2VAL |
| Description | IC,MICROCONTROLLER,16-BIT,CPU12 CPU,CMOS,QFP,112PIN,PLASTIC |
| PDF file | Total 1327 pages (File size: 7M) |
| Chip Manufacturer | ROCHESTER |
Chapter 20 Serial Communication Interface (S12SCIV5)
IREN
SCI Data
Register
RXD
Infrared
Receive
Decoder
Ir_RXD
SCRXD
Receive
Shift Register
RE
R16XCLK
Receive
and Wakeup
Control
RWU
LOOPS
RSRC
M
Baud Rate
Generator
WAKE
Data Format
Control
ILT
PE
SBR12:SBR0
PT
R8
NF
FE
PF
RAF
IDLE
RDRF
OR
RIE
TIE
TDRE
SCI
Interrupt
Request
RDRF/OR
ILIE
IDLE
Bus
Clock
TDRE
TC
TCIE
TC
RXEDGIE
TE
÷16
Transmit
Control
LOOPS
SBK
RSRC
T8
Transmit
Shift Register
SCI Data
Register
Active Edge
Detect
Break Detect
RXEDGIF
BKDIF
RXD
BKDFE
BKDIE
SCTXD
R16XCLK
Infrared
Transmit
Encoder
R32XCLK
TNP[1:0]
IREN
LIN Transmit BERRIF
Collision
Detect
BERRIE
BERRM[1:0]
Ir_TXD
TXD
Figure 20-14. Detailed SCI Block Diagram
20.4.1
Infrared Interface Submodule
This module provides the capability of transmitting narrow pulses to an IR LED and receiving narrow
pulses and transforming them to serial bits, which are sent to the SCI. The IrDA physical layer
specification defines a half-duplex infrared communication link for exchange data. The full standard
includes data rates up to 16 Mbits/s. This design covers only data rates between 2.4 Kbits/s and 115.2
Kbits/s.
The infrared submodule consists of two major blocks: the transmit encoder and the receive decoder. The
SCI transmits serial bits of data which are encoded by the infrared submodule to transmit a narrow pulse
MC9S12XE-Family Reference Manual , Rev. 1.19
738
Freescale Semiconductor
Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not
available from Freescale for import or sale in the United States prior to September 2010: S12XE products in 208 MAPBGA packages
