27-18
MC9328MX1 Reference Manual
MOTOROLA
Universal Asynchronous Receiver/Transmitters (UART) Modules
27.5.10 Escape Sequence Detection
An escape sequence typically consists of 3 characters entered in rapid succession (such as +++). Because
these are valid characters by themselves, the time between characters determines if it is a valid escape
sequence. Too much time between two of the + characters is interpreted as two + characters, and not part
of an escape sequence.
The software chooses the escape character and writes its value to the UART Escape Character Register
(UESC_1/UESC_2). The hardware compares this value to incoming characters in the RxFIFO. When an
escape character is detected, the internal escape timer starts to count. The software specifies a time-out
value for the maximum allowable time between escape characters. The escape timer is programmable in
intervals of 2 msec to a maximum interval of 8.192 seconds.
The escape sequence detection feature is available for 16 MHz, 25 MHz or 30 MHz
reference frequencies
only. Enabling this feature with any other reference frequency is not supported and is undefined.Set the
corresponding reference frequency bits (REF16 in UCR4_1/UCR4_2, REF25 or REF30 in
UCR3_1/UCR3_2).
Table 27-10. Escape Timer Scaling
UTIM_1/
UTIM_2
Register
Maximum Time Between Specified
Escape Characters
0x000
2 msec
0x001
4 msec
0x002
6 msec
0x003
8 msec
0x004
10 msec
…
…
0F8
498 msec
0F9
500 msec
…
…
9C3
5 sec
…
…
FFD
8.188 sec
FFE
8.190 sec
FFF
8.192 sec
Note:
To calculate the time interval:
(UTIM 1) × 0.002 = Time_Interval
Example:
(09C3 + 1) × 0.002 = 5 sec.
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 ...