NEC 78K0 Series User Manual page 184

(4) Prescaler mode register 0n (PRM0n)
PRM0n is the register that sets the TM0n count clock and TI00n and TI01n pin input valid edges.
Rewriting PRM0n is prohibited during operation (when TMC0n3 and TMC0n2 = other than 00).
PRM0n can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PRM0n to 00H.
Cautions 1. Do not apply the following setting when setting the PRM0n1 and PRM0n0 bits to 11 (to
specify the valid edge of the TI00n pin as a count clock).
• Clear & start mode entered by the TI00n pin valid edge
• Setting the TI00n pin as a capture trigger
2. If the operation of the 16-bit timer/event counter 0n is enabled when the TI00n or TI01n pin
is at high level and when the valid edge of the TI00n or TI01n pin is specified to be the rising
edge or both edges, the high level of the TI00n or TI01n pin is detected as a rising edge.
Note this when the TI00n or TI01n pin is pulled up. However, the rising edge is not detected
when the timer operation has been once stopped and then is enabled again.
3. The valid edge of TI010 and timer output (TO00) cannot be used for the P01 pin at the same
time, and the valid edge of TI011 and timer output (TO01) cannot be used for the P06 pin at
the same time. Select either of the functions.
µ
Remark n = 0: PD78F0531, 78F0532, 78F0533
µ
n = 0, 1: PD78F0534, 78F0535, 78F0536, 78F0537, 78F0537D
184
CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 AND 01
Preliminary User's Manual U17260EJ3V1UD