psd511b1 STMicroelectronics, psd511b1 Datasheet - Page 51

• Manufacturer Part Number: psd511b1
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMicroelectronics

I/O Ports
(Cont.)
48
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:
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 :
or
9.3.14 Port E – Functionality and Structure
Port E can be configured to perform one or more of the following functions:
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:
or
or
Standard MCU I/O Mode
PLD Input – direct input to ZPLD
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
Data Port
– Port C: D[0-7] for 8-bit non-multiplexed bus
– Port D: D[8-15] for 16-bit non-multiplexed bus
Open Drain – select CMOS or Open Drain driver
Data In Register as input in the Standard MCU I/O Mode
ZPLD input
Standard MCU I/O Mode
PLD I/O
Address Out – latched address lines A[0-7] are assigned to pins PE[0-7].
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
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
PE4 – TIMER1-IN
PE5 – TIMER2-IN
PE6 – TIMER3-IN
PE7 – APD CLK
Data In Register as input in Standard MCU I/O Mode
PE Macrocell as PLD input
Alternate Function In
assigned to pins PD[0-7]
:load/store/enable/ disable input to Timer 0
:load/store/enable/disable input to Timer 1
:load/store/enable/disable input to Timer 2
:load/store/enable/disable input to Timer 3
:clock input for Automatic Power Down Counter