SDA6000 Datasheet, PDF (97/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
Interrupt and Trap Functions
are accepted by the CPU. However requests that have already entered the pipeline at
that time will be processed. When IEN is set to ‘1’, all interrupt sources, which have been
individually enabled by the interrupt enable bits in their associated control registers, are
globally enabled.
Note: Traps are non-maskable and are therefore not affected by the IEN bit.
5.2
Operation of the PEC Channels
M2’s Peripheral Event Controller (PEC) provides 8 PEC service channels, which move
a single byte or word between two locations in the entire memory space. Packet
transfers are provided with channels 0 and 1. This is the fastest possible interrupt
response and in many cases is sufficient to service the respective peripheral request
(e.g. serial channels, etc.). Each channel is controlled by a dedicated PEC Channel
Counter/Control register (PECCx) and a pair of pointers for the source (SRCPx) and
destination (DSTPx) of the data transfer.
The PECC registers control the action that is performed by the respective PEC channel.
Compared to existing C16x architectures, the PEC transfer function is enhanced by
extended functionality. The extended PEC functions are defined as follows:
• Source pointer and destination pointer are extended to 24-bit pointer, thus enabling
PEC controlled data transfers between any two locations within the total address
space. Both 8-bit segment numbers of every source/destination pointer pair are
defined in one 16-bit SFR register; thus, 8 PEC segment number registers are
available for the 8 PEC channels.
• For every two channels a chaining feature is provided. When enabled in the PEC
control register, a termination interrupt of one channel will automatically switch
transfer control to the other channel of the channel pair.
Extended PEC Channel Control
The PEC control registers with the extended functionality and their application for new
PEC control are defined as follows:
Users Manual
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2000-06-15