SM59R16A5/SM59R09A5/SM59R05A5
8-Bit Micro-controller
64KB/36KB/20KB with ISP Flash
& 2KB RAM embedded
4. CPU Engine
The SM59R16A5 engine is composed of four components:
a. Control unit
b. Arithmetic – logic unit
c. Memory control unit
d. RAM and SFR control unit
The SM59R16A5 engine allows to fetch instruction from program memory and to execute using RAM or SFR.
following paragraphs describe the main engine registers.
Mnemonic
ACC
B
PSW
SP
DPL
DPH
DPL1
DPH1
AUX
RCON
IFCON
4.1.
Description
Accumulator
B register
Program status
word
Stack Pointer
Data pointer low 0
Data pointer high
0
Data pointer low 1
Data pointer high
1
Auxiliary register
Internal RAM
control register
Interface control
register
Accumulator
Direct
E0h
F0h
D0h
81h
82h
83h
84h
85h
91h
86h
8Fh
ITS
CDPR
-
BRGS
-
P4SPI
Bit 7
ACC.7
B.7
CY
Bit 6
Bit 5
8051 Core
ACC.6 ACC.5
B.6
B.5
AC
F0
Bit 4
ACC.4
B.4
Bit 3
ACC.3
B.3
Bit 2
ACC.2
B.2
OV
Bit 1
ACC.1
B.1
PSW.1
Bit 0
ACC.0
B.0
P
The
RESET
00H
00H
00H
07H
00H
00H
00H
00H
P0KBI
P2PW
M
DPS
00H
00H
EMEN
ISPE
00H
RS[1:0]
SP[7:0]
DPL[7:0]
DPH[7:0]
DPL1[7:0]
DPH1[7:0]
P4UR
1
P4IIC
RCON[7:0]
-
ALEC[1:0]
ACC is the Accumulator register. Most instructions use the accumulator to store the operand.
Mnemonic: ACC
7
6
ACC.7 ACC.6
5
ACC05
4
ACC.4
3
ACC.3
2
ACC.2
1
ACC.1
Address: E0h
0
Reset
ACC.0
00h
ACC[7:0]: The A (or ACC) register is the standard 8052 accumulator.
4.2.
B Register
The B register is used during multiply and divide instructions. It can also be used as a scratch pad register to store
temporary data.
Mnemonic: B
7
6
B.7
B.6
5
B.5
4
B.4
3
B.3
2
B.2
1
B.1
Address: F0h
0
Reset
B.0
00h
B[7:0]: The B register is the standard 8052 register that serves as a second accumulator.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M047
26
Ver.G SM59R16A5 01/2014
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
