S912XET256J2VAGR Freescale Semiconductor, S912XET256J2VAGR Datasheet - Page 757
S912XET256J2VAGR
Manufacturer Part Number
S912XET256J2VAGR
Description
16-bit Microcontrollers - MCU Watchdog OSC/Timer -40 C to + 105 C HCS12X MCU SPI
Manufacturer
Freescale Semiconductor
Datasheet
1.S912XEQ512J3CAGR.pdf
(1324 pages)
Specifications of S912XET256J2VAGR
Core
HCS12X
Data Bus Width
16 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
256 KB
Data Ram Size
16 KB
On-chip Adc
Yes
Package / Case
LQFP
Mounting Style
SMD/SMT
A/d Bit Size
12 bit
A/d Channels Available
24
Interface Type
CAN, SCI, SPI
Maximum Operating Temperature
+ 105 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
119
Number Of Timers
25
Program Memory Type
Flash
Supply Voltage - Max
1.98 V, 2.9 V, 5.5 V
Supply Voltage - Min
1.72 V, 2.7 V, 3.13 V
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Enable single-wire operation by setting the LOOPS bit and the receiver source bit, RSRC, in SCI control
register 1 (SCICR1). Setting the LOOPS bit disables the path from the RXD pin to the receiver. Setting
the RSRC bit connects the TXD pin to the receiver. Both the transmitter and receiver must be enabled
(TE = 1 and RE = 1).The TXDIR bit (SCISR2[1]) determines whether the TXD pin is going to be used as
an input (TXDIR = 0) or an output (TXDIR = 1) in this mode of operation.
20.4.8
In loop operation the transmitter output goes to the receiver input. The RXD pin is disconnected from the
SCI.
Enable loop operation by setting the LOOPS bit and clearing the RSRC bit in SCI control register 1
(SCICR1). Setting the LOOPS bit disables the path from the RXD pin to the receiver. Clearing the RSRC
bit connects the transmitter output to the receiver input. Both the transmitter and receiver must be enabled
(TE = 1 and RE = 1).
20.5
20.5.1
See
20.5.2
20.5.2.1
Normal mode of operation.
To initialize a SCI transmission, see
Freescale Semiconductor
Section 20.3.2, “Register
Initialization/Application Information
Loop Operation
Reset Initialization
Modes of Operation
Run Mode
In single-wire operation data from the TXD pin is inverted if RXPOL is set.
In loop operation data from the transmitter is not recognized by the receiver
if RXPOL and TXPOL are not the same.
Figure 20-31. Loop Operation (LOOPS = 1, RSRC = 0)
Descriptions”.
MC9S12XE-Family Reference Manual Rev. 1.25
Transmitter
Receiver
Section 20.4.5.2, “Character
NOTE
NOTE
Chapter 20 Serial Communication Interface (S12SCIV5)
Transmission”.
RXD
TXD
757
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