ST10R272L - MEMORY ORGANIZATION
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3.1.3
PEC source and destination pointers
The 16 word-locations in the internal RAM from 00’FCE0h to 00’FCFFh (just below the
bit-addressable space, 00’FD00h - 00’FDFEh) provide source and destination address
pointers for data transfers on the eight PEC channels. Each channel uses a pair of pointers,
stored in two subsequent word-locations with the source pointer (SRCPx) on the lower and
the destination pointer (DSTPx) on the higher word address (x = 7...0).
Whenever a PEC data-transfer is performed, the pair of source and destination pointers,
selected by the specified PEC channel number, is accessed independently of the current
DPP register contents. Also, the locations referred to by these pointers are accessed
independently of the current DPP register contents. If a PEC channel is not used, the
corresponding pointer locates the available area which can be used for word or byte data
storage.
For more details about the use of the source and destination pointers for PEC data transfers
see “INTERRUPT AND TRAP FUNCTIONS” on page 83.
<CP> + 0Ah
RH5
RL5
R5
<CP> + 08h
RH4
RL4
R4
<CP> + 06h
RH3
RL3
R3
<CP> + 04h
RH2
RL2
R2
<CP> + 02h
RH1
RL1
R1
<CP> + 00h
RH0
RL0
R0
Internal RAM Address
Byte Registers
Word Register
Table 4 Mapping of general purpose registers to RAM addresses
