PSD4235G2V-10U STMICROELECTRONICS [STMicroelectronics], PSD4235G2V-10U Datasheet - Page 12

• Manufacturer Part Number: PSD4235G2V-10U
• Description: Flash In-System Programmable (ISP) Peripherals for 16-bit MCUs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

PSD4256G6V
Table 2. TQFP80 Pin Description
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This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
ADIO0-
ADIO7
ADIO8-
ADIO15
CNTL0
CNTL1
CNTL2
RESET
PA0-PA7
Pin Name
3-7
10-12
13-20
59
60
40
39
51-58
Pin
I/O
I/O
I
I
I
I
I/O
CMOS
or
Open
Drain
Type
This is the lower Address/Data port. Connect your MCU address or address/data bus
according to the following rules:
1. If your MCU has a multiplexed address/data bus where the data is multiplexed with
2. If your MCU does not have a multiplexed address/data bus, connect A0-A7 to this
3. If you are using an 80C51XA in burst mode, connect A4/D0 through A11/D7 to this
ALE or AS latches the address. The PSD drives data out only if the READ signal is
active and one of the PSD functional blocks has been selected. The addresses on this
port are passed to the PLDs.
This is the upper Address/Data port. Connect your MCU address or address/data bus
according to the following rules:
1. If your MCU has a multiplexed address/data bus where the data is multiplexed with
2. If your MCU does not have a multiplexed address/data bus, connect A8-A15 to this
3. If you are using an 80C51XA in burst mode, connect A12/D8 through A19/D15 to this
ALE or AS latches the address. The PSD drives data out only if the READ signal is
active and one of the PSD functional blocks has been selected. The addresses on this
port are passed to the PLDs.
The following control signals can be connected to this pin, based on your MCU:
1. WR – active Low, WRITE Strobe input.
2. R_W – active High, READ/active Low WRITE input.
3. WRL – active Low, WRITE to Low-byte.
This pin is connected to the PLDs. Therefore, these signals can be used in decode and
other logic equations.
The following control signals can be connected to this pin, based on your MCU:
1. 1RD – active Low, READ Strobe input.
2. E – E clock input.
3. DS – active Low, Data Strobe input.
4. LDS – active Low, Strobe for low data byte.
This pin is connected to the PLDs. Therefore, these signals can be used in decode and
other logic equations.
READ or other Control input pin, with multiple configurations. Depending on the MCU
interface selected, this pin can be:
1. PSEN – Program Select Enable, active Low in code retrieve bus cycle (80C51XA
2. BHE – High-byte enable, 16-bit data bus.
3. UDS – active Low, Strobe for high data byte, 16-bit data bus mode.
4. SIZ0 – Byte enable input.
5. LSTRB – Low Strobe input.
This pin is also connected to the PLDs.
Active Low input. Resets I/O Ports, PLD Macrocells and some of the Configuration
Registers and JTAG registers. Must be Low at Power-up. RESET also aborts any Flash
memory Program or Erase cycle that is currently in progress.
These pins make up Port A. These port pins are configurable and can have the
following functions:
1. MCU I/O – standard output or input port.
2. CPLD Macrocell (McellA0-McellA7) outputs.
3. Latched, transparent or registered PLD inputs (can also be PLD input for address A16
the lower address bits, connect AD0-AD7 to this port.
port.
port.
the address bits, connect A8-A15 or AD8-AD15 to this port.
port.
port.
mode).
and above).
Description