UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 427

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

20.3 External Device Expansion Function Timing
(1) RD pin (Alternate function: P64)
(2) WR pin (Alternate function: P65)
(3) WAIT pin (Alternate function: P66)
(4) ASTB pin (Alternate function: P67)
(5) AD0 to AD7, A8 to A15 pins (Alternate function: P40 to P47, P50 to P57)
Timing control signal output pins in the external memory expansion mode are as follows.
The timing charts are shown in Figures 20-4 to 20-7.
Read strobe signal output pin. The read strobe signal is output in data read and instruction fetch from external
memory.
During internal memory read, the read strobe signal is not output (maintains high level).
Write strobe signal output pin. The write strobe signal is output in data write to external memory.
During internal memory write, the write strobe signal is not output (maintains high level).
External wait signal input pin.
When the external wait is not used, the WAIT pin can be used as an I/O port.
During internal memory access, the external wait signal is ignored.
Address strobe signal output pin. The address strobe signal is output regardless of data access and instruction
fetch from external memory.
During internal memory access, the address strobe signal is output.
Address/data signal output pins. Valid signal is output or input during data accesses and instruction fetches from
external memory.
These signals change even during internal memory access (output values are undefined).
CHAPTER 20 EXTERNAL DEVICE EXPANSION FUNCTION
User’s Manual U14046EJ5V0UD
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