SM59R02G1 Datasheet, PDF (16/57 Pages) SyncMOS Technologies,Inc – Instruction-set compatible with MCS-51

SM59R02G1
8-Bit Micro-controller
8KB with ISP Flash
& 256B RAM embedded
Function Description
1. General Features
SM59R02G1 is an 8-bit micro-controller。All of its functions and the detailed meanings of SFR will be given in the following
sections.
1.1. Embedded Flash
The program can be loaded into the embedded 8KB Flash memory via its writer or In-System Programming (ISP).
1.2. IO Pads
The SM59R02G1 has six I/O ports: Port 0, Port 1, Port 2, Port 3, Port 4, and Port 5. Ports 0, 1, 2, 3, 4 are 8-bit ports and
Port 5 is a 2-bit port (Only Bit 4 and Bit 5). These are: quasi-bidirectional (standard 8051 port outputs), push-pull, open
drain, and input-only. As description in section 5.
The XTAL2 and XTAL1 can define as P5.4 and P5.5 by writer or ISP. When user use external OSC as system clock and
input into XTAL1, Only XTAL2 can be defined as P5.4.
All the pads for P0 ~ P5 are with slew rate to reduce EMI. The other way to reduce EMI is to disable the ALE output if
unused. This is selected by its SFR. The IO pads can withstand 4KV ESD in human body mode guaranteeing the
SM59R02G1’s quality in high electro-static environments.
1.3. 2T/1T Selection
The conventional 52-series MCUs are 12T, i.e., 12 oscillator clocks per machine cycle. SM59R02G1 is a 2T or 1T MCU,
i.e., its machine cycle is two-clock or one-clock. In the other words, it can execute one instruction within two clocks or
only one clock. The difference between 2T mode and 1T mode are given in the example in Fig. 1-1.
Fig. 1-1(a): The waveform of internal instruction signal in 2T mode
Fig. 1-1(b): The waveform of internal instruction signal in 1T mode
The default is in 2T mode, and it can be changed to 1T mode if IFCON [7] (at address 8Fh) is set to high any time. Not
every instruction can be executed with one machine cycle. The exact machine cycle number for all the instructions are
given in the next section.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M061
16
Ver.G SM59R02G1 09/2015