Sub-Block Description
MOTOROLA
Universal Asynchronous Receiver/Transmitters (UART) Modules
27-11
Figure 27-3. Transmitter
FIFO
Empty Interrupt Suppression Flow Chart
27.5.3 Receiver
The receiver accepts a serial data stream and converts it into parallel characters. When enabled, it searches
for a start bit, qualifies it, and samples the following data bits at the bit-center. Jitter tolerance and noise
immunity are provided by sampling at a 16x rate and using voting techniques to clean up the samples.
Once the start bit is found, the data bits, parity bit (if enabled), and stop bits (either 1 or 2 depending on
user selection) are shifted in. Parity is checked and its status reported in the URXDn_1/URXDn_2 register
when parity is enabled. Frame errors and BREAKs are also checked and reported. When a new character is
ready to be received by the RxFIFO, the receive data ready (RDR) bit in the UART Status Register 2
(USR2_1/USR2_2) is asserted and an interrupt is posted (if DREN
=
1). If the receiver trigger level is set
to 0, the receiver ready interrupt flag (RRDY) is asserted and an interrupt is posted if the receiver ready
Assert
Transmitter
FIFO Empty
Flag
Transmitter
FIFO
Empty
Deassert
Transmitter
FIFO Empty
Flag
Deassert
Transmitter
FIFO Empty
Flag
Deassert
Transmitter
FIFO Empty
Flag
Transmitter
FIFO
Empty
Transmitter
FIFO
Empty
Deassert
Transmitter
FIFO Empty
Flag
Transmitter
Shift Register
Empty
Transmitter
FIFO Contains > 2
Characters
Reset = Peripheral Reset OR Software Reset
Reset
Reset
Reset
Reset
Reset
Y
Y
N
Y
Y
Y
N
N
N
N
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Page 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Page 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Page 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Page 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
Page 282: ...14 10 MC9328MX1 Reference Manual MOTOROLA Watchdog Timer Module ...
Page 300: ...15 18 MC9328MX1 Reference Manual MOTOROLA Analog Signal Processor ASP ...
Page 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
Page 478: ...19 40 MC9328MX1 Reference Manual MOTOROLA LCD Controller ...
Page 574: ...21 32 MC9328MX1 Reference Manual MOTOROLA Memory Stick Host Controller MSHC Module ...
Page 598: ...23 16 MC9328MX1 Reference Manual MOTOROLA Real Time Clock RTC ...
Page 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Page 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
Page 736: ...26 10 MC9328MX1 Reference Manual MOTOROLA General Purpose Timers ...
Page 854: ...29 18 MC9328MX1 Reference Manual MOTOROLA I2C Module ...
Page 900: ...30 46 MC9328MX1 Reference Manual MOTOROLA Synchronous Serial Interface SSI ...
Page 942: ...32 26 MC9328MX1 Reference Manual MOTOROLA GPIO Module and I O Multiplexer IOMUX ...