PSD3XX Family
PSD3XX
ZPSD3XX
ZPSD3XXV
PSD3XXR ZPSD3XXR ZPSD3XXRV
Low Cost Microcontroller Peripherals
Table of Contents
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3
4
5
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7
Introduction...........................................................................................................................................................1
Notation ................................................................................................................................................................2
Key Features ........................................................................................................................................................4
PSD3XX Family Feature Summary ......................................................................................................................5
Partial Listing of Microcontrollers Supported ........................................................................................................6
Applications ..........................................................................................................................................................6
ZPSD Background................................................................................................................................................6
7.1
Integrated Power ManagementTM Operation.............................................................................................7
8
9
Operating Modes (MCU Configurations) ............................................................................................................10
Programmable Address Decoder (PAD).............................................................................................................12
10 I/O Port Functions...............................................................................................................................................15
10.1 CSIOPORT Registers..............................................................................................................................15
10.2 Port A (PA0-PA7).....................................................................................................................................16
10.2.1 Port A (PA0-PA7) in Multiplexed Address/Data Mode................................................................16
10.2.2 Port A (PA0-PA7) in Non-Multiplexed Address/Data Mode........................................................17
10.3 Port B (PB0-PB7).....................................................................................................................................18
10.3.1 Port B (PA0-PA7) in Multiplexed Address/Data Mode................................................................18
10.3.2 Port B (PA0-PA7) in Non-Multiplexed Address/Data Mode........................................................19
10.4 Port C (PC0-PC2)....................................................................................................................................20
10.5 ALE/AS Input Pin.....................................................................................................................................20
11 PSD Memory ......................................................................................................................................................21
11.1 EPROM....................................................................................................................................................21
11.2 SRAM (Optional)......................................................................................................................................21
11.3 Page Register (Optional) .........................................................................................................................21
11.4 Programming and Erasure.......................................................................................................................21
12 Control Signals ...................................................................................................................................................22
12.1 ALE or AS................................................................................................................................................22
12.2 WR or R/W...............................................................................................................................................22
12.3 RD/E/DS (DS option not available on 3X1 devices) ................................................................................22
12.4 PSEN or PSEN........................................................................................................................................22
12.5 A19/CSI ...................................................................................................................................................23
12.6 Reset Input ..............................................................................................................................................24
13 Program/Data Space and the 8031 ....................................................................................................................26
14 Systems Applications..........................................................................................................................................27
15 Security Mode.....................................................................................................................................................30
16 Power Management............................................................................................................................................30
16.1 CSI Input..................................................................................................................................................30
16.2 CMiser Bit ................................................................................................................................................30
16.3 Turbo Bit (ZPSD Only).............................................................................................................................31
16.4 Number of Product Terms in the PAD Logic............................................................................................31
16.5 Composite Frequency of the Input Signals to the PAD Logic..................................................................32
16.6 Loading on I/O Pins .................................................................................................................................33
17 Calculating Power...............................................................................................................................................34
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