CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Preliminary User’s Manual U16846EJ1V0UD
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(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.
Figure 6-2. Format of 16-Bit Timer Counter 00 (TM00)
TM00
Symbol
FF11H
FF10H
Address: FF10H, FF11H After reset: 0000H R
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 the TI000 pin is input in the mode in which clear & start occurs when inputting the valid
edge of the TI000 pin
<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)
CR000
Symbol
FF13H
FF12H
Address: FF12H, FF13H After reset: 0000H R/W
•
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 pin valid edge is set using prescaler mode register 00 (PRM00) (see Table 6-2).