NEC 78K0 User Manual page 126

(1) 16-bit timer counter 00 (TM00)
TM00 is a 16-bit read-only register that counts count pulses.
The counter is incremented in synchronization with the rising edge of the input clock.
Address: FF10H, FF11H
Symbol
TM00
The count value is reset to 0000H in the following cases.
<1> At RESET input
<2> If TMC003 and TMC002 are cleared
<3> If the valid edge of TI000 is input in the mode in which clear & start occurs when inputting the valid edge of
TI000
<4> If TM00 and CR000 match in the mode in which clear & start occurs on a match of TM00 and CR000
<5> OSPT00 is set in one-shot pulse output mode
(2) 16-bit timer capture/compare register 000 (CR000)
CR000 is a 16-bit register that has the functions of both a capture register and a compare register. Whether it is
used as a capture register or as a compare register is set by bit 0 (CRC000) of capture/compare control register
00 (CRC00).
CR000 can be set by a 16-bit memory manipulation instruction.
RESET input clears CR000 to 0000H.
Figure 6-3. Format of 16-Bit Timer Capture/Compare Register 000 (CR000)
Address: FF12H, FF13H
Symbol
CR000
• When CR000 is used as a compare register
The value set in CR000 is constantly compared with the 16-bit timer counter 00 (TM00) count value, and an
interrupt request (INTTM000) is generated if they match. The set value is held until CR000 is rewritten.
• When CR000 is used as a capture register
It is possible to select the valid edge of the TI000 pin or the TI010 pin as the capture trigger. The TI000 or
TI010 valid edge is set using prescaler mode register 00 (PRM00) (see Table 6-2).
126
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Figure 6-2. Format of 16-Bit Timer Counter 00 (TM00)
After reset: 0000H
FF11H
After reset: 0000H
FF13H
User's Manual U16227EJ2V0UD
R
FF10H
R/W
FF12H