XA-SCC Datasheet, PDF (8/42 Pages) NXP Semiconductors – CMOS 16-bit communications microcontroller

Philips Semiconductors
CMOS 16-bit communications microcontroller
Preliminary specification
XA-SCC
CONTROL REGISTER OVERVIEW
There are two types of control registers in the XA-SCC, these are
SFRs (Special Function Registers), and MMRs (Memory Mapped
Registers.) The SFR registers, with the exception of MRBL, MRBH,
MICFG, BCR, BRTH, BRTL, and RSTSRC are the standard XA core
registers. See WARNINGs about BCR, BRTH, and BRTL in the
Table below.
Table 1. Special Function Registers (SFR)^{1, 2, 3}
SFRs are accessed by “direct addressing” only (see IC25 XA User
Manual for direct addressing.) The MMRs are specific to the
XA-SCC on board peripherals, and can be accessed by any
addressing mode that can be used for off chip data accesses. The
MMRs are implemented in a relocatable block. See the MIF chapter
in the XA-SCC User Manual for details on how to relocate the
MMRs by writing a new base address into the MRBL and MRBH
(MMR Base Low and High) registers.
NAME
DESCRIPTION
SFR
Address
MSB
BIT FUNCTIONS AND ADDRESSES
LSB
RESET
VALUE
BCR
Bus Configuration Reg
46Ah WARNING—Never write to the BCR register in the XA-SCC part—it is initialized to
07h
RESERVED—see warning
07h, the only legal value. This is not the same as for other XA derivatives.
BTRH
BTRL
Bus Timing Reg High
Bus Timing Reg Low
469h
WARNING—Immediately after reset, always write BTRH = 51h, followed by writing
FFh
BTRL = 40h in that order. Follow these two writes with five NOPS. This is not the
468h
same as for other XA derivatives.
EFh
MRBL#
MRBH#
MICFG#
MMR Base Address Low
MMR Base Address High
ClkOut Tri-St Enable
1 = Enabled
496h
497h
499h
MA15
MA23
–
MA14
MA22
–
MA13
MA21
–
MA12
MA20
–
–
MA19
–
–
MA18
–
–
MRBE
x0h
MA17
MA16
xx
–
CLKOE 01h
CS
Code Segment
443h
00h
DS
Data Segment
441h
00h
ES
Extra Segment
442h
00h
IEH*
Interrupt Enable High
33F
33E
33D
33C
33B
33A
339
338
427h EHSWR3 EHSWR2 EHSWR1 EHSWR0 ESCP
EAuto ESC23 ESC01
00h
IEL*
IPA0
IPA1
IPA2
IPA3
IPA4
IPA5
IPA6
IPA7
Interrupt Enable Low
Interrupt Priority A0
Interrupt Priority A1
Interrupt Priority A2
Interrupt Priority A3
Interrupt Priority A4
Interrupt Priority A5
Interrupt Priority A6
Interrupt Priority A7
337
336
335
334
333
332
331
330
426h
EA
EDMAH EDMAL
EX2
ET1
EX1
ET0
EX0
00h
4A0h
–
PT0
–
PX0
00h
4A1h
–
PT1
–
PX1
00h
4A2h
–
PDMAL
–
PX2
00h
4A3h
Reserved
–
PDMAH
00h
4A4h
–
PSC23
–
PSC01
00h
4A5h
–
PSCP
–
PAutoB
00h
4A6h
–
PHSWR1
–
PHSWR0
00h
4A7h
–
PHSWR3
–
PHSWR2
00h
P0*
Port 0
P1*
Port 1
P2*
Port 2
387
386
385
384
383
382
381
380
430h
FFh
38F
38E
38D
38C
38B
38A
389
388
431h
FFh
397
396
395
394
393
392
391
390
432h
FFh
1999 Mar 29
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