TC1796
Peripheral Units (Vol. 2 of 2)
Asynchronous/Synchronous Serial Interface (ASC)
User’s Manual 19-1 V2.0, 2007-07
ASC, V2.0
19 Asynchronous/Synchronous Serial Interface (ASC)
This chapter describes the two Asynchronous/Synchronous Serial Interfaces of the
TC1796, ASC0 and ASC1. It contains the following sections:
• Functional description of the ASC kernel, valid for ASC0 and ASC1 (see Page 19-1)
• ASC kernel register description, describes all ASC kernel specific registers, valid for
ASC0 and ASC1 (see Page 19-19)
• TC1796 implementation-specific details and registers of the ASC0/ASC1 interfaces
(see Page 19-30)
Note: The ASC kernel register names described in Section 19.2 will be referenced in
the TC1796 User’s Manual by the module name prefix “ASC0_” for the ASC0
interface and by “ASC1_” for the ASC1 interface.
19.1 ASC Kernel Description
Figure 19-1 shows a global view of the ASC interface.
Figure 19-1 General Block Diagram of the ASC Interface
The ASC module communicates with the external world via two I/O lines. The RXD line
is the receive data input signal (and also output signal in Synchronous Mode), and TXD
is the transmit output signal.
Clock control, address decoding, and interrupt service request control are managed
outside the ASC module kernel.
MCB05762
Clock
Control
Address
Decoder
Interrupt
Control
f
ASC
ASC
Module
(Kernel)
Port
Control
RXD
TXD
RXD
TXD
To DMA
EIR
TBIR
TIR
RIR
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