UPD75518 NEC, UPD75518 Datasheet - Page 104

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

104
(a) SBI functions
• Address/command/data identification function
• Address-based chip select function
• Wake-up function
• Acknowledge signal (ACK) control function
• Busy signal (BUSY) control function
Serial data is classified into three types: Address, command, and data.
The master selects a chip by address transfer.
A slave can easily check address reception (for chip select identification) with the wake-up function.
This function can be set or released by software.
When the wake-up function is set, an interrupt (IRQCSI0) is generated when a match address is
received. For this reason, in communication with multiple devices, a CPU other than a selected
slave can operate independently of serial communication.
The acknowledge signal, which is used to confirm the reception of serial data, can be controlled.
The busy signal, which is used to post the busy state of a slave, can be controlled.
PD75518(A)