intd.
83C152 HARDWARE DESCRIPTION
Byte
Address
080H
088H
090H
098H
OAOH
OA8H
OBOH
OB8H
OCOH
OC6H
ODOH
OD8H
OEOH
OE8H
OFOH
OF8H
SYMBOUCNAMEBITMAP
(MSB)
(LSB)
PO.7
PO.6 PO.5
PO.4 PO.3 PO.2
Po.1 Po.o (Po)
TF1
.TR1 TFO
TRO
IE1 ITI IEO
ITO
(TCON)
P1.7 I P1.6 I P1.5 I P1.4 I P1.3 I P1.2 I P1.1 I P1.O I (Pi)
SMO I SM1 I SM2 I REN I TB8 I RB8 I TI I RI I (SCON)
P2.7
P2.6 P2.5
P2.4 P2.3 P2.2
P2.1 P2.O (P2)
EA — — ES ETl EX1
ETo EXO
(IE)
P3.7 P3.6 P3.5 P3.4 P3.3 P3.2
P3.1 P3.O (P3)
—
— —
Ps PT1
Pxl
PTO
Pxo
(1P)
P4.7 I P4.6 I P4.5 I P4.4 I P4.3 ! P4.2 I P4.1 I P4,0
— —
I EGSTE ] EDMA1
I
EGSTV ] EDMAO I EGSRE I EGSRV
CY I AC FO
I
RS1 RSO Ov I —
P
LNI I NOACK I UR I TCDT I TDN I TFNF I TEN I DMA
OVRI RCABTI AE I CRCE I RDN I RFNE I GREN I HABEN
(P4)
(IEN1)
(Psw)
(TSTAT)
(A)
(RSTAT)
(B)
— —
PGSTE
PDMA1 PGSTV PDMAO
PGSRE PGSRV (IPN1)
Figure 2.3C. Bit Addresses
2.1.3
PROGRAMMEMORY
The
83C152contains SK of ROM program memory,
and the 80C152uses only externalprogram memory.
Figure 2.4 showsthe programmemorylocationsand
wherethey reside. The user is alloweda maximumof
64K of program memory. In the 83C152program
memoryfetchesbeyond8K automaticallyaccessexter-
nal programmemory.Whenprogrammemoryis exter-
nallyaddr- all of the Port 2 pinsemit the address.
Sinceall of Port 2 is affectedby the address, unused
addresspinscannotbe usedas normalI/O ports evenif
lessthan 64Kof memoryis beingaccessed.
EXTERNAL
EXTERNALIF~= O
INTERNALIF~= 1
FFFFH
1FFFH
OOOOH
270427-4
Figure 2.4. Program Memory
7-1o
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