NEC PD78F9488 Manuale Utente

CHAPTER  7   8-BIT  TIMERS  50,  60,  AND  61 

 

User’s Manual  U15331EJ4V1UD

8-bit timers 50, 60, and 61 are controlled by the following six registers. 
 

•  8-bit timer mode control register 50 (TMC50) 
•  8-bit timer mode control register 60 (TMC60) 
•  Carrier generator output control register 60 (TCA60) 
•  8-bit timer mode control register 61 (TMC61) 
•  Port mode register 3 (PM3) 
• Port 3 

 
(1)  8-bit timer mode control register 50 (TMC50) 

8-bit timer mode control register 50 (TMC50) is used to control the timer 50 count clock setting and the 
operation mode setting. 
TMC50 is set with a 1-bit or 8-bit memory manipulation instruction. 
RESET input sets this register to 00H. 

Symbol 

<7> 

<6> 

5 4 3 2 1 

<0> 

Address 

After 

reset 

R/W 

TMC50 TCE50  TEG50  TCL502 TCL501 TCL500 TMD501

TMD500

TOE50  FF4DH 

00H 

R/W 

 

 

TCE50 

Control of TM50 count operation

 

 

0 

Clear TM50 count value and stop operation 

 

1 

Start count operation 

 

 

TEG50 

Selection of valid edge of TM50 count clock 

 

0 

Count at the rising edge of the count clock 

 

1 

Count at both edges of the count clock

 

 

 

TCL502 

TCL501 

TCL500 

Selection of timer 50 count clock 

 0  0  0 

f

X

 (5.0 MHz) 

 0  0  1 

f

X

/2

3

 (625 kHz) 

 0  1  0 

f

X

/2

7

 (39.1 kHz) 

 0  1  1 

f

XT

 (32.768 kHz) 

 

1 

0 

0 

Timer 60 match signal (INTTM60) 

 

1 

0 

1 

Carrier clock (in carrier generator mode) or timer 60 output signal (in other than carrier 
generator mode) 

 

Other than above 

Setting prohibited 

 

 

TMD501  TMD500  TMD601  TMD600 

Selection of operation mode for timer 50

 

 0  0 

× 

0 

Stand-alone mode (8-bit counter mode) 

 0 1 0 1 

16-bit 

counter 

mode (cascade connection mode) 

 0 0 1 1 

Carrier 

generator 

mode 

 1  0 

× 

0 

PWM output mode 

 

Other than above 

Setting prohibited