Renesas H8S/2111B 用户手册

Rev. 1.00, 05/04, page 128 of 544 

 

•  PA2/KIN10/PS2AC 

The pin function is switched as shown below according to the combination of the KBIOE bit in 
KBCRH_0 of the keyboard buffer controller, and the PA2DDR bit. 

 

KBIOE 0 

1 

PA2DDR 0  1 

— 

PA2 input pin 

PA2 output pin 

PS2AC output pin 

Pin Function 

KIN10 input pin, PS2AC input pin* 

 Note:  *  When the KBIOE bit is set to 1, this pin is an NMOS open-drain output, and has direct 

bus drive capability. This pin can always be used as the PS2AC or 

KIN10 input pin. 

 

•  PA1/KIN9, PA0/KIN8 

The pin function is switched as shown below according to the state of the PAnDDR bit. 

 

PAnDDR 0 

1 

PAn input pin 

PAn output pin 

Pin Function 

KINm input pin* 

Note:  *  This pin can always be used as the 

KINm input pin. (n = 1 or 0, m = 9 or 8) 

 

Port A has an on-chip input pull-up MOS function that can be controlled by software. This input 
pull-up MOS function can be specified as on or off on a bit-by-bit basis. 

The input pull-up MOS for pins PA7 to PA4 is always off when IICS is set to 1. When the 
keyboard buffer control pin function is selected for pins PA7 to PA2, the input pull-up MOS is 
always off. 

Table 7.6 summarizes the input pull-up MOS states. 

Off Off 

On/Off 

On/Off 

[Legend] 
Off: 

Input pull-up MOS is always off.  

On/Off: On when the pin is in the input state, PADDR = 0, and PAODR = 1; otherwise off.