UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 100

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UPD75238GJ

Manufacturer Part Number
UPD75238GJ
Description
4 BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC [NEC]
Datasheet
SB0/SB1
SB0/SB1
SB0/SB1
100
Address transfer
Command transfer
Data transfer
SCK0
SCK0
SCK0
(i)
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.
Bus release signal
Command signal
Fig. 4-53 Timing of SBI Transfer
A7
C7
D7
8
8
A0
D0 ACK
C0 ACK
9
9
9
BUSY
BUSY
ACK
BUSY
READY
READY
PD75238

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