NEC UPD703116 User Manual page 318

Figure 9-52. Mode 1 (When Rising Edge Is Specified as Valid Edge of TIUD1n Pin):
TIUD1n
TCUD1n
TM1n
Remark n = 0, 1
(ii) Mode 2 (PRM1n register's PRM12 bit = 1, PRM11 bit = 0, PRM10 bit = 1)
The count conditions in mode 2 are as follows.
• TM1n up-count upon detection of valid edge of TIUD1n pin
• TM1n down-count upon detection of valid edge of TCUD1n pin
Caution If the count clock is simultaneously input to the TIUD1n pin and the TCUD1n pin,
Figure 9-53. Mode 2 (When Rising Edge Is Specified as Valid Edge of TIUD1n, TCUD1n Pins)
TIUD1n
TCUD1n
TM1n
Remark n = 0, 1
318
CHAPTER 9 TIMER/COUNTER FUNCTION
In Case of Simultaneous TIUD1n, TCUD1n Pin Edge Timing
0007H 0006H
Down count
count operation is not performed and the immediately preceding value is held.
0006H 0007H
Up count
User's Manual U14492EJ5V0UD
0005H 0004H 0005H
Up count
0008H 0007H
Hold value Down count
0006H 0007H
0006H 0005H