MB89537 View Datasheet(PDF) - Fujitsu

Part Name

Description

Manufacturer

MB89537

MB89530 Series 8-bit Original Microcontroller

Fujitsu 

MB89530 Series

9. Details on Handling C Terminal of MB89530 Series

The MB89530 series contains the following products. The regulator integrated model and the regulator-less

model have different performance characteristics.

Part No.

Operation Voltage integrated model

Terminal type Terminal treatments

MB89PV530

Not included

N.C terminal Not required

MB89P538

2.7 V to 5.5 V

Included

C terminal

Fixed to VCC

Fixed to VSS

MB89537/537C

MB89538/538C

2.2 V to 3.6 V

Not included

N.C terminal Not required

MB89F538L

2.3 V to 3.6 V

Although these product models have the same internal resources, the operation sequence after a power-on

reset is different between the regulator integrated model and regulator-less model.

The operation sequence after a power-on reset of each model is shown below.

Power supply (VCC)

Voltage step-down circuit stabilization time

+ oscillation stabilization time

(219/Fch)

CPU operation of regulator

integrated model

Oscillation stabiliza-

tion time (218/Fch)

CPU operation of regurator-less

model

Fch : Crystal oscillator frequency

CPU started on regulator-less

model (Reset vector)

CPU started on regulator

integrated model (Reset vector)

As above, the regulator integrated model starts the CPU behind the regulator-less model. This is because the

regulator requires a settling time for normal operation.

The MB89P538 offers a choice of regulator-integrated and regulator-less models selectable depending on the

C-terminal treatment. Use the right one for your mask board.

10. Note to Noise In the External Reset Pin (RST)

If the reset pulse applied to the external reset pin (RST) does not meet the specifications, it may cause malfunc-

tions. Use caution so that the reset pulse less than the specifications will not be fed to the external reset pin (RST) .

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