Справочник Пользователя для IBM EM78P447N

 (V1.1) 03.30.2005

 

 

 

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Table 3  EM78P447NBP and EM78P447NBWM Pin Description 

VDD 4 - 

■ Power supply. 

OSCI 29  I 

■  XTAL type: Crystal input terminal or external clock input pin. 
■  RC type: RC oscillator input pin. 

OSCO 28  I/O 

■  XTAL type: Output terminal for crystal oscillator or external clock input pin.
■  RC type: Instruction clock output. 
■  External clock signal input. 

TCC 3 I 

■  The real time clock/counter (with Schmitt trigger input pin), must be tied to 
  VDD or VSS if not in use. 

/RESET 30 

I 

■  Input pin with Schmitt trigger. If this pin remains at logic low, the controller 
  will keep in reset condition. 

P50~P57 

8~11,2~1, 

32~31 

I/O 

■  P50~P57 are bi-directional I/O pins. 

P60~P67 12~19 

I/O 

■  P60~P67 are bi-directional I/O pins. These can be pulled -high internally by 
 software 

control. 

P70~P77 20~27 

I/O 

■  P70~P77 are bi-directional I/O pins. 
■  P74~P75 can be pulled-high internally by software control. 
■  P76~P77 can have open-drain output by software control. 
■  P70 and P71 can also be defined as the R-option pins. 

/INT 7 I 

■  External interrupt pin triggered by falling edge. 

VSS 6 - 

■ Ground. 

NC 5 

- 

■ No connection. 

 

Table 4  EM78P447NCK and EN78P447NCM Pin Description 

VDD 3 - 

■ Power supply. 

OSCI 23  I 

■  XTAL type: Crystal input terminal or external clock input pin. 
■  RC type: RC oscillator input pin. 

OSCO 22  I/O 

■  XTAL type: Output terminal for crystal oscillator or external clock input pin.
■  RC type: Instruction clock output. 
■  External clock signal input. 

TCC 2 I 

■  The real time clock/counter (with Schmitt trigger input pin) must be tied to 
  VDD or VSS if not in use. 

/RESET 24 

I 

■  Input pin with Schmitt trigger. If this pin remains at logic low, the controller 
  will also remain in reset condition. 

P50~P54 6~9,1 

I/O 

■  P50~P54 are bi-directional I/O pins. 

P60~P67 10~17 

I/O 

■  P60~P67 are bi-directional I/O pins.  These can be pulled-high internally by 
 software 

control. 

P74~P77 18~21 

I/O 

■  P74~P77 are bi-directional I/O pins. 
■  P74~P75 can be pulled-high internally by software control. 
■  P76~P77 can have open-drain output by software control. 

/INT 5 I 

■  External interrupt pin triggered by falling edge. 

VSS 4 - 

■ Ground. 

NC 3 

- 

■ No connection.