Queued Serial Multi-Channel Module
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
15-63
Figure 15-33. Queue Transmitter Block Enhancements
15.8.4
QSCI1 Additional Transmit Operation Features
•
Available on a single SCI channel (SCI1) implemented by the queue transmit enable (QTE) bit set
by software. When enabled, (QTE = 1) the TDRE bit should be ignored by software and the TC bit
is redefined (as described later).
•
When the queue is disabled (QTE = 0), the SCI functions in single buffer transfer mode where the
queue size is set to one (QTSZ = 0000), and TDRE and TC function as previously defined.
Locations SCTQ[0:15] can be used as general purpose 9-bit registers. All other bits pertaining to
the queue should be ignored by software.
•
Programmable queue up to 16 transmits (SCTQ[0:15]) which may allow for infinite and
continuous transmits.
•
Available transmit wrap function to prevent message breaks for transmits greater than 16. This is
achieved by the transmit wrap enable (QTWE) bit. When QTWE is set, the hardware is allowed to
10 (11) - Bit
Tx Shift Register
ST
O
P
ST
AR
T
H (8) 7 6 5 4 3 2 1 0 L
TxD
SCTQ0
SCTQ1
SCTQ15
9-b
it 16:
1 MUX
Transmitter
Baud Rate
Clock
4-bits
QT
SZ
[0:
3
]
QT
HEI
QB
HE
I
Queue CONTROL
QT
E
QPE
N
D[
0:3
]
QT
HE
QB
HE
QT
WE
Queue STATUS
Queue Control
Logic
SCI Interrupt Request
SC1DR Tx Buffer
SCI1 Non-Queue Operation
Data bus
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...