MA014B Datasheet, PDF (4/14 Pages) Megawin Technology Co., Ltd – Single chip 8-bit CPU

Memory Map
There are 128 bytes SRAM in MA014B. They are working RAM (0000H to 007FH) and stacks
(0100H to 017FH). The stack areas are shared with address 0000H to 007FH. The address 00E0H
to 00FFH are special function registers area. Bit-manipulation instruction is available on SRAM
except SFR.
There are 48K bytes program/data ROM in MA014B. The ROM address from 4000H to FFFFH can
store program and data. The address mapping of MA014B is shown as below.
MA014B Memory Map
0000H ~ 007FH
0080H ~ 00DFH
00E0H ~ 00FFH
0100H ~ 017FH
Zero Page SRAM
SFR
Stack Area
Share area
0180H ~ 3FFFH
4000H ~ FFFBH
Program/Data
FFFCH ~ FFFFH
Interrupt Vector
Area
Low Voltage Reset:
The MA014B provides low voltage reset circuit in order to monitor the supply voltage of the device.
If the supply voltage of the device is within the range 0.9V ~ VLVR , such as changing a battery, the
LVR will automatically reset the device internally.
The LVR includes the following specifications:
1. The low voltage (0.9V~VLVR) has to remain in their original state to exceed 1ms. If the low
voltage state does not exceed 1ms, the LVR will ignore it and do not perform a reset function.
2. In the LVR mode, the on-chip oscillator is stopped and the on-chip SRAM is held. Port1 set to
high, port0 set to input mode with weakly pull high and IRO is output high.
Low Voltage Detector:
The low voltage detector (2.1V) has no de-bounce ability. When VDD is equal or lower than LVD, the
LVD flag to be set high immediately. De-bounce should be implemented by software.
MEGAWIN
MA014B Series Technical Summary
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