Tandy 1000 HX Technical Reference Manual page 188

NEC
/uPD80C35/C48, /;PD48
Figure 9. Major Input and Output Signals
Instruction Set
Instruction Set Symbol Definitions
Symbol
A
A C
addr
b
BS
BUS
C
CLK
C N T
data
DBF
FO, F1
INT
n
P C
Pp
P S W
Rr
Dmcription
Accumulator
Auxiliary carry flag
Program or data memory address (a
o
-a7) or
(ao-aio)
Accumulator bit (b = 0-7)
Bank switch
Bus
Carry flag
Clock
Counter
8-bit binary data (d
o
-d
7
)
Memory bank flip-flop
Flag 0, flag 1
Interrupt pin
Indicates the hex number of the specified register
or port
Program counter
Port 1, port 2, or ports 4-7 ( p = 1 , 2 or 4-7)
Program status word
Register (r=0-7)
Symbol
SP
T
TF
T0.T1
#
@
x
(x)
((x))
*-
AND
O R
EXOR
Description
Stack pointer
Timer
Timer flag
Test 0, test 1 pin
Prefix for immediate data
Prefix for indirect address
Indicates the hex number corresponding to the
accumulator bit or page number specified in the
operand
Contents of RAM
Contents of memory location addressed by (x)
Transfer direction, result
Logical product (logical AND)
Logical sum (logical OR)
Exclusive-OR
Complement
4 - 2 2 3
Figure 8. External Clock Frequency Reference Circuit