NEC PD78F9488 Manuale Utente

 

User’s Manual  U15331EJ4V1UD

Serial interface 1A0 provides the following three modes. 
 
•  Operation stop mode 
•  3-wire serial I/O mode 
•  3-wire serial I/O mode with automatic transmit/receive function 
 

In operation stop mode, serial transfer is not executed, thereby reducing the power consumption.  The P23/SCK10, 

P24/SO10, and P25/SI10 pins can be used as normal I/O ports. 

 
(1) Register 

Operation stop mode is set by serial operation mode register 1A0 (CSIM1A0). 
 
(a)  Serial operation mode register 1A0 (CSIM1A0) 

CSIM1A0 is set with a 1-bit or 8-bit memory manipulation instruction. 
RESET input clears CSIM1A0 to 00H. 

Symbol 

<7> 6 <5> 

<4> 3  2  1  0 

Address 

After 

reset 

R/W 

CSIM1A0 CSIE10  DIR10  ATE0  LSCK10 

0 

0 

SCL101 SCL100  FF78H 

00H 

R/W 

 

Specification of operation enable/disable 

CSIE10 

Shift register operation 

Serial counter 

Port

 

0 

Operation stopped 

Cleared  

Port function 

1 

Operation enabled 

Count operation enabled 

Serial function + port function 

 
Note  When CSIE10 = 0 (SIO1A0 operation stop status), the SCK10/P23, SO10/P24, and SI10/P25 pins can 

freely be used as port pins.