PSD501B1 datasheet(51/153 Pages) STMICROELECTRONICS

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PSD5XX Family

9.3.13 Port C and Port D – Functionality and Structure

Port C and D are identical in function and structure and each can be configured to perform

one or more of the following operating modes:

t Standard MCU I/O Mode

t PLD Input – direct input to ZPLD

t Address Out – latched address outputs

– Port C: A[0-7] are asigned to pins PC[0-7]

– Port D: A[0-7] for 8-bit multiplexed bus, or A[8-15] for 16-bit multiplexed bus are

assigned to pins PD[0-7]

t Data Port

– Port C: D[0-7] for 8-bit non-multiplexed bus

– Port D: D[8-15] for 16-bit non-multiplexed bus

t Open Drain – select CMOS or Open Drain driver

Figures 23 and 24 show the structure of a Port C or D pin. If the pin is configured as output

port, the multiplexer selects one of the two inputs as output. If the pin is configured as input,

the input connects to :

t Data In Register as input in the Standard MCU I/O Mode

t ZPLD input

9.3.14 Port E – Functionality and Structure

Port E can be configured to perform one or more of the following functions:

t Standard MCU I/O Mode

t PLD I/O

t Address Out – latched address lines A[0-7] are assigned to pins PE[0-7].

t Special Function Out – in this mode, Port E pin is configured as an output port for the

following signals:

PE2 – INTERRUPT – interrupt output from Interrupt Controller

PE4 – Terminal Count output, Timer0

PE5 – Terminal Count output, Timer1

PE6 – Terminal Count output, Timer2

PE7 – Terminal Count output, Timer3

t Alternate Function In – in this mode, the inputs to Port E pins are:

PE0 – BHE/ or PSEN/ or WRH/ or UDS/ or SIZ0

PE1 – ALE

PE3 – TIMER0-IN

:load/store/enable/ disable input to Timer 0

PE4 – TIMER1-IN

:load/store/enable/disable input to Timer 1

PE5 – TIMER2-IN

:load/store/enable/disable input to Timer 2

PE6 – TIMER3-IN

:load/store/enable/disable input to Timer 3

PE7 – APD CLK

:clock input for Automatic Power Down Counter

Figure 25 shows the structure of a Port E pin. The Control Logic block selects one of four

sources through the multiplexer for pin output. If the pin is configured as input, the input

goes to:

t Data In Register as input in Standard MCU I/O Mode

t PE Macrocell as PLD input

t Alternate Function In

I/O Ports

(Cont.)

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