MA015 Datasheet, PDF (28/29 Pages) Megawin Technology Co., Ltd – Build-in watchdog timer

MA015 Datasheet
Version 2.00
Note:
Here are customer’s requirements:
(before 2007/3/14)
1. Increasing Port 1:3 source current to 10mA, sink current remaining unchanged.
2. Having internal reset circuit requiring no external components but can be OR-ed to external circuitry if required.
3. DC operation to be 2.2V @ 4MHz (is 2.4V at present). Note upper limit can be < 5.5V
4. Change X32I to Schmitt input pin. Change X32O to input/output pin.
5. Combining AGND & GND and AVDD & VDD to be single GND and VDD pins. Why are 4 supply connections
needed? This would save us cost by eliminating 2 bonds on every single remote.
6. Costing of RAM increased by 64 bytes, 128 bytes or 256 bytes.
7. Any implications of above for development tools e.g. ICE, Flash, etc.
8. All the above adds no extra pins to the IC and, if item 5 can be implemented, we'd save pins. Note
implementation of items 2 & 4 will also save on external component cost.
(2007/3/14)
1. Supply voltage: in the spec, the operation voltage is marked as 1.8V to 3.6V, however the specification also
notes that the ceramic oscillator at 4MHz requires 2.1V - which voltage is correct?
2. Pad count - maintaining the current pad count (i.e. 36 pads) only allows port 3 to be 7 bits (you have 4 bits
assigned to 3 pads - pads 33-36).
3. Timer Registers - we need to keep all three timers (TIMER0, TIMER1, TIMER2) - in fact, a fourth timer would
be desirable.
4. Port sink currents - all ports should sink 6mA - note that it is important that they all sink the same current.
5. IRO - P1.3 - should source 10mA
6. Reset OK function - please remove/disable.
7. Remove the interrupt function from Port 2 - we'd prefer to have the new port, Port 3 with the wake-up interrupts
(maskable).
8. Keep the DIV0 and DIV1 registers to drive the associated Port 3 output.
(2007/3/16)
1. Timers - we don't want to change any of the timers - currently, you have updated Timer0 to be an 8 bit timer -
we would prefer that you revert this back to 16 bit as in the MLC041.
2. RESOK (Reset OK) - we would like to see this function removed - in fact, we don't want to make use of this nor
the watchdog timers.
3. Page 19: "5. Added Port 3.0 ~ Port 3.7 for GPIO, Port 3.6 can be the clock source of timer." - port 3.7 does not
exist... should be power 3.0 to Port 3.6.
This document information is the intellectual property of Megawin Technology.
 Megawin Technology Co., Ltd. 2011 All right reserved.
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