12

RESX

Reset input signal

When RESX = 0 and maintain the length of 256 clock cycles, chip will generate a reset action.

13

CS

Chip select signal.

If the MCU interface is set to the serial mode, this pin can be set to GPIB [0], internal pull-up resistor.

14

RD

Read control signals.

In parallel mode of 8080, this pin is RD# signal, RD#=0, which means MCU reads data or status read cycle to the chip.

In the 6800 parallel mode, this pin is the EN signal, EN=1, indicating that the MCU's control of the chip is in the enable cycle.

If the MCU interface is set to serial mode, this pin can be set to GPIB[1] with an internal pull-up resistor.

15

WR

write control signal

In 8080 parallel port mode, this pin is the WR# signal, WR#

= 0, representing the MCU A command write or data write cycle is performed on the chip.

In 6800 parallel port mode, this pin is RW# signal, RW# = 1, representing MCU Data read or status read cycle is performed on the chip. RW# = 0, representing The MCU performs a command write or data write cycle to the chip.

If the MCU interface is set to serial mode, this pin can be set to GPIB[2],There are internal pull-up resistors.

16

RS/A0

command or data select signal

A0 = 0, which means that the MCU reads the status of the chip or the command write cycle.

A0 = 1, which means the MCU reads or writes data to the chip.