668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 155
668-0011
Manufacturer Part Number
668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0011
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1043
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Part Number:
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A sample HDLC interrupt handler is shown below for Serial Port E.
18.3.3 More on Clock Synchronization and Data Encoding
The transmitter is not capable of sending an arbitrary number of bits, but only a multiple
of bytes. However, the receiver can receive frames of any bit length. If the last “byte” in
the frame is not eight bits, the receiver sets a status flag that is buffered along with this last
byte. Software can then use the table below to determine the number of valid data bits in
this last “byte.” Note that the receiver transfers all bits between the opening and closing
flags, except for the inserted zeros, to the receiver data buffer.
Chapter 18 Serial Ports E – F
hdlc_sere_isr::
rx_ready:
check_for_tx:
done:
push af
ioi ld a, (SESR)
bit 7,a
push af
jr
; check status byte in A for abort or invalid CRC flags
ioi ld a, (SEDR)
; store byte in A here
pop af
bit 3,a
jr nz, done
; check status byte in A for transmit finish reason (CRC, abort, etc.)
; get next byte to be transmitted into A here; if it is the last
;
ioi ld (SEDR), a
pop af
ipres
ret
z, check_for_tx
byte of the packet, load it into SEAR or SELR instead
Last Byte Bit Pattern
bbbbbbb0
bbbbbb01
bbbbb011
bbbb0111
bbb01111
bb011111
b0111111
; get status
; check if byte ready in RX buffer
; save status for next check
; read byte and clear interrupt
; check if TX buffer was emptied
; load next byte into buffer and clear interrupt
Valid Data Bits
7
6
5
4
3
2
1
145
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