MC9S08RE16CFDER Freescale Semiconductor, MC9S08RE16CFDER Datasheet - Page 160
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MC9S08RE16CFDER
Manufacturer Part Number
MC9S08RE16CFDER
Description
IC MCU 16K FLASH 1K RAM 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Specifications of MC9S08RE16CFDER
Core Processor
HCS08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
39
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-QFN
Processor Series
S08RE
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SCI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
39
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMO9S08RG60E
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
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Serial Communications Interface (S08SCIV1)
12.3.3.2.1
When WAKE = 0, the receiver is configured for idle-line wakeup. In this mode, RWU is cleared
automatically when the receiver detects a full character time of the idle-line level. The M control bit selects
8-bit or 9-bit data mode that determines how many bit times of idle are needed to constitute a full character
time (10 or 11 bit times because of the start and stop bits). The idle-line type (ILT) control bit selects one
of two ways to detect an idle line:
12.3.3.2.2
When WAKE = 1, the receiver is configured for address-mark wakeup. In this mode, RWU is cleared
automatically when the receiver detects a logic 1 in the most significant bit of a received character (eighth
bit in M = 0 mode and ninth bit in M = 1 mode).
12.3.4
The SCI system has three separate interrupt vectors to reduce the amount of software needed to isolate the
cause of the interrupt. One interrupt vector is associated with the transmitter for TDRE and TC events.
Another interrupt vector is associated with the receiver for RDRF and IDLE events, and a third vector is
used for OR, NF, FE, and PF error conditions. Each of these eight interrupt sources can be separately
masked by local interrupt enable masks. The flags can still be polled by software when the local masks are
cleared to disable generation of hardware interrupt requests.
The SCI transmitter has two status flags that optionally can generate hardware interrupt requests. Transmit
data register empty (TDRE) indicates when there is room in the transmit data buffer to write another
transmit character to SCI1D. If the transmit interrupt enable (TIE) bit is set, a hardware interrupt will be
requested whenever TDRE = 1. Transmit complete (TC) indicates that the transmitter is finished
transmitting all data, preamble, and break characters and is idle with TxD1 high. This flag is often used in
systems with modems to determine when it is safe to turn off the modem. If the transmit complete interrupt
enable (TCIE) bit is set, a hardware interrupt will be requested whenever TC = 1. Instead of hardware
interrupts, software polling may be used to monitor the TDRE and TC status flags if the corresponding TIE
or TCIE local interrupt masks are 0s.
When a program detects that the receive data register is full (RDRF = 1), it gets the data from the receive
data register by reading SCI1D. The RDRF flag is cleared by reading SCI1S1 while RDRF = 1 and then
reading SCI1D.
When polling is used, this sequence is naturally satisfied in the normal course of the user program. If
hardware interrupts are used, SCI1S1 must be read in the interrupt service routine (ISR). Normally, this is
done in the ISR anyway to check for receive errors, so the sequence is automatically satisfied.
The IDLE status flag includes logic that prevents it from getting set repeatedly when the RxD1 line remains
idle for an extended period of time. IDLE is cleared by reading SCI1S1 while IDLE = 1 and then reading
160
•
•
When ILT = 0, the idle bit counter starts after the start bit so the stop bit and any logic 1s at the end
of a character count toward the full character time of idle.
When ILT = 1, the idle bit counter doesn’t start until after a stop bit time, so the idle detection is
not affected by the data in the last character of the previous message.
Interrupts and Status Flags
Idle-Line Wakeup
Address-Mark Wakeup
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Freescale Semiconductor
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