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
Содержание DragonBall MC9328MX1
Страница 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Страница 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
Страница 116: ...3 30 MC9328MX1 Reference Manual MOTOROLA Memory Map ...
Страница 126: ...4 10 MC9328MX1 Reference Manual MOTOROLA ARM920T Processor ...
Страница 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Страница 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
Страница 281: ...Programming Model MOTOROLA Watchdog Timer Module 14 9 ...
Страница 282: ...14 10 MC9328MX1 Reference Manual MOTOROLA Watchdog Timer Module ...
Страница 300: ...15 18 MC9328MX1 Reference Manual MOTOROLA Analog Signal Processor ASP ...
Страница 438: ...18 16 MC9328MX1 Reference Manual MOTOROLA Serial Peripheral Interface Modules SPI 1 and SPI 2 ...
Страница 478: ...19 40 MC9328MX1 Reference Manual MOTOROLA LCD Controller ...
Страница 542: ...20 64 MC9328MX1 Reference Manual MOTOROLA Multimedia Card Secure Digital Host Controller Module MMC SD ...
Страница 574: ...21 32 MC9328MX1 Reference Manual MOTOROLA Memory Stick Host Controller MSHC Module ...
Страница 598: ...23 16 MC9328MX1 Reference Manual MOTOROLA Real Time Clock RTC ...
Страница 670: ...24 72 MC9328MX1 Reference Manual MOTOROLA SDRAM Memory Controller ...
Страница 726: ...25 56 MC9328MX1 Reference Manual MOTOROLA SmartCard Interface Module SIM ...
Страница 736: ...26 10 MC9328MX1 Reference Manual MOTOROLA General Purpose Timers ...
Страница 854: ...29 18 MC9328MX1 Reference Manual MOTOROLA I2C Module ...
Страница 900: ...30 46 MC9328MX1 Reference Manual MOTOROLA Synchronous Serial Interface SSI ...
Страница 942: ...32 26 MC9328MX1 Reference Manual MOTOROLA GPIO Module and I O Multiplexer IOMUX ...