MC9S08EL16CTJ Freescale Semiconductor, MC9S08EL16CTJ Datasheet - Page 260
![MCU 16KB FLASH SLIC 20TSSOP](/photos/12/26/122655/mc9s08el16ctj_sml.jpg)
MC9S08EL16CTJ
Manufacturer Part Number
MC9S08EL16CTJ
Description
MCU 16KB FLASH SLIC 20TSSOP
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.DEMO9S08EL32.pdf
(356 pages)
Specifications of MC9S08EL16CTJ
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, LIN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
16
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
20-TSSOP
Processor Series
S08EL
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SCI, SPI, I2C, SLIC
Maximum Clock Frequency
200 KHz
Number Of Programmable I/os
16
Number Of Timers
2
Operating Supply Voltage
5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMO9S08EL32AUTO, DEMO9S08EL32
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 12 Channel
For Use With
DEMO9S08EL32 - BOARD DEMO FOR 9S08 EL MCUDEMO9S08EL32AUTO - DEMO BOARD EL32 AUTO
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Serial Communications Interface (S08SCIV4)
SCI communications require the transmitter and receiver (which typically derive baud rates from
independent clock sources) to use the same baud rate. Allowed tolerance on this baud frequency depends
on the details of how the receiver synchronizes to the leading edge of the start bit and how bit sampling is
performed.
The MCU resynchronizes to bit boundaries on every high-to-low transition, but in the worst case, there are
no such transitions in the full 10- or 11-bit time character frame so any mismatch in baud rate is
accumulated for the whole character time. For a Freescale Semiconductor SCI system whose bus
frequency is driven by a crystal, the allowed baud rate mismatch is about ±4.5 percent for 8-bit data format
and about ±4 percent for 9-bit data format. Although baud rate modulo divider settings do not always
produce baud rates that exactly match standard rates, it is normally possible to get within a few percent,
which is acceptable for reliable communications.
14.3.2
This section describes the overall block diagram for the SCI transmitter, as well as specialized functions
for sending break and idle characters. The transmitter block diagram is shown in
The transmitter output (TxD) idle state defaults to logic high (TXINV = 0 following reset). The transmitter
output is inverted by setting TXINV = 1. The transmitter is enabled by setting the TE bit in SCIxC2. This
queues a preamble character that is one full character frame of the idle state. The transmitter then remains
idle until data is available in the transmit data buffer. Programs store data into the transmit data buffer by
writing to the SCI data register (SCIxD).
The central element of the SCI transmitter is the transmit shift register that is either 10 or 11 bits long
depending on the setting in the M control bit. For the remainder of this section, we will assume M = 0,
selecting the normal 8-bit data mode. In 8-bit data mode, the shift register holds a start bit, eight data bits,
and a stop bit. When the transmit shift register is available for a new SCI character, the value waiting in
the transmit data register is transferred to the shift register (synchronized with the baud rate clock) and the
transmit data register empty (TDRE) status flag is set to indicate another character may be written to the
transmit data buffer at SCIxD.
If no new character is waiting in the transmit data buffer after a stop bit is shifted out the TxD pin, the
transmitter sets the transmit complete flag and enters an idle mode, with TxD high, waiting for more
characters to transmit.
262
Transmitter Functional Description
BUSCLK
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
BAUD RATE GENERATOR
OFF IF [SBR12:SBR0] = 0
MODULO DIVIDE BY
(1 THROUGH 8191)
Figure 14-12. SCI Baud Rate Generation
SBR12:SBR0
BAUD RATE =
DIVIDE BY
16
Rx SAMPLING CLOCK
(16 × BAUD RATE)
[SBR12:SBR0] × 16
BUSCLK
Tx BAUD RATE
Figure
Freescale Semiconductor
14-2.
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