PSD835G2-70UI datasheet(57/110 Pages) STMICROELECTRONICS

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PSD8XX Family

PSD835G2

The

PSD835G2

Functional

Blocks

(cont.)

MCU

Port E (3:0)

Port E (7:4)

Port F (3:0)

Port F (7:4)

Port G (3:0)

Port G (7:4)

80C51XA

N/A

Addr (7:4)

N/A

Addr (7:4)

Addr (11:8)

N/A

80C251

N/A

Addr (11:8)

Addr (15:12)

(Page Mode)

All Other

Eight-Bit

Addr (3:0)

Addr (7:4)

Addr (3:0)

Addr (7:4)

Addr (3:0)

Addr (7:4)

Multiplexed

8-Bit

Non-Mux

N/A

Addr (3:0)

Addr (7:4)

Bus

Table 18. I/O Port Latched Address Output Assignments

9.4.2.4 Address In Mode

For microcontrollers that have more than 16 address lines, the higher addresses can be

connected to Ports A, B, C, D or F and are routed as inputs to the PLDs. The address

input can be latched in the Input Micro

⇔Cell by the address strobe (ALE/AS). Any

input that is included in the DPLD equations for the Main Flash, Boot Flash, or SRAM is

considered to be an address input.

9.4.2.5 Data Port Mode

Port F can be used as a data bus port for a microcontroller with a non-multiplexed

address/data bus. The Data Port is connected to the data bus of the microcontroller. The

general I/O functions are disabled in Port F if the ports are configured as Data Port. Data

Port Mode is automatically configured in PSDsoft when a non-multiplexed bus MCU is

selected.

9.4.2.6 Peripheral I/O Mode

Peripheral I/O Mode can be used to interface with external 8-bit peripherals. In this mode,

all of Port F serves as a tri-stateable, bi-directional data buffer for the microcontroller.

Peripheral I/O Mode is enabled by setting Bit 7 of the VM Register to a ‘1’. Figure 25

shows how Port A acts as a bi-directional buffer for the microcontroller data bus if

Peripheral I/O Mode is enabled. An equation for PSEL0 and/or PSEL1 must be specified in

PSDsoft. The buffer is tri-stated when PSEL 0 or 1 is not active.

9.4.2.7 JTAG ISP

Port E is JTAG compliant, and can be used for In-System Programming (ISP). You can

multiplex JTAG operations with other functions on Port E because ISP is not performed

during normal system operation. For more information on the JTAG Port, refer to

section 9.6.

9.4.2.3 Address Out Mode

For microcontrollers with a multiplexed address/data bus, Address Out Mode can be used

to drive latched addresses onto the port pins. These port pins can, in turn, drive external

devices. Either the output enable or the corresponding bits of both the Direction Register

and Control Register must be set to a ‘1’ for pins to use Address Out Mode. This must be

done by the MCU at run-time. See Table 18 for the address output pin assignments on

Ports E, F and F for various MCUs.

Note: Do not drive address lines with Address Out Mode to an external memory device if

it is intended for the MCU to boot from the external device. The MCU must first boot from

PSD memory so the Direction and Control register bits can be set.

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