Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  12   SERIAL  ARRAY  UNIT 

R01UH0305EJ0200  Rev.2.00 

 

 

431  

Jul 04, 2013 

Using the serial array unit requires setting of the registers that control the port functions multiplexed on the target 

channel (port mode register (PMxx), port register (Pxx), port input mode register (PIMxx), port output mode register 

(POMxx), port mode control register (PMCxx)). 

For details, see 4.3.1  Port mode registers (PMxx), 4.3.2  Port registers (Pxx), 4.3.4  Port input mode registers 

(PIMxx), 4.3.5  Port output mode registers (POMxx), and 4.3.6  Port mode control registers (PMCxx). 

 

Specifically, using a port pin with a multiplexed serial data or serial clock output function (e.g. P02/ANI17/SO10/TxD1) 

for serial data or serial clock output, requires setting the corresponding bits in the port mode control register (PMCxx) and 

port mode register (PMxx) to 0, and the corresponding bit in the port register (Pxx) to 1. 

When using the port pin in N-ch open-drain output (V

DD

 

tolerance

/EV

DD

 

tolerance

) mode, set the corresponding 

bit in the port output mode register (POMxx) to 1. When connecting an external device operating on a different potential 

(1.8 V or 2.5 V), see 4.4.5  Handling different potential (1.8 V, 2.5 V) by using I/O buffers. 

 

Example:   When P02/ANI17/SO10/TxD1 is to be used for serial data output 

 

Set the PMC02 bit of port mode control register 0 to 0. 

 

Set the PM02 bit of port mode register 0 to 0. 

 

Set the P02 bit of port register 0 to 1. 

 

Specifically, using a port pin with a multiplexed serial data or serial clock input function (e.g. 

P03/ANI16/SI10/RxD1/SDA10) for serial data or serial clock input, requires setting the corresponding bit in the port mode 

register (PMxx) to 1, and the corresponding bit in the port mode control register (PMCxx) to 0.  In this case, the 

corresponding bit in the port register (Pxx) can be set to 0 or 1. 

When the TTL input buffer is selected, set the corresponding bit in the port input mode register (PIMxx) to 1.  When 

connecting an external device operating on a different potential (1.8 V or 2.5 V), see 4.4.5  Handling different potential 

(1.8 V, 2.5 V) by using I/O buffers. 

 

Example:   When P03/ANI16/SI10/RxD1/SDA10 is to be used for serial data input 

 

Set the PMC03 bit of port mode control register 0 to 0. 

 

Set the PM03 bit of port mode register 0 to 1. 

 

Set the P03 bit of port register 0 to 0 or 1. 

 

Notes  1.   25 to 48-pin products 

 64-pin product