tm
TE
CH
T81L0010A
9. Function Description
9.1. Special Function Register
F8H
F0H
B
E8H
E0H
ACC
D8H
D0H
PSW
C8H T2CON T2MOD
TL2
TH2
C0H
B8H
IP
B0H
P3
A8H
IE
A0H
P2
98H
SCON SBUF
90H
P1
88H
TCON TMOD
TL0
TL1
TH0
TH1
80H
P0*
SP
DPL
DPH
*Note: P0:Internal still keeping, but for pad dominate, no external pin assignment
PCON
Accumulator : ACC
ACC is the Accumulator register. The mnemonics for Accumulator-Specific instructions, however, refer to the
Accumulator simply as A.
B Register : B
The B register is used during multiply and divide operations. For other instructions it can be treated as another scratch
pad register.
Program Status Word : PSW
The PSW register contains program status information as detailed in
CY
AC
F0
RS1
RS0
OV
--
P
BIT SYMBOL FUNCTION
PSW.7 CY Carry flag.
PSW.6 AC Auxiliary Carry flag. (For BCD operations.)
PSW.5 F0
Flag 0. (Available to the user for general purposes.)
PSW.4 RS1 Register bank select control bit 1.
Set/cleared by software to determine working register bank. (See
Note.)
PSW.3 RS0 Register bank select control bit 0.
Set/cleared by software to determine working register bank. (See
Note.)
PSW.2 OV Overflow flag.
PSW.1 —
User-definable flag.
PSW.0 P
Parity flag.
Set/cleared by hardware each instruction cycle to indicate an odd/even number of “one” bits in the
Accumulator, i.e., even parity.
NOTE:
The contents of (RS1, RS0) enable the working register banks as follows:
(0,0)— Bank 0 (00H–07H)
(0,1)— Bank 1 (08H–0fH)
(1,0)— Bank 2 (10H–17H)
(1,1)— Bank 3 (18H–17H)
TM Technology Inc. reserves the right
to change products or specifications without notice.
P. 6
Publication Date: JAN. 2006
Revision:B
TMT [ TAIWAN MEMORY TECHNOLOGY ]
