NEC ?PD703302, Руководство пользователя

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CHAPTER 9 8-BIT TIMER H
User’s Manual U16896EJ2V0UD
321
Figure 9-3. Timing of Interval Timer/Square Wave Output Operation (1/2)
Basic operation (operation when 01H
≤
CMPn0
≤
FEH)
00H
Count clock
Count start
8-bit timer counter
Hn count value
CMPn0
TMHEn
INTTMHn
TOHn
01H N
Clear
Clear
N
00H 01H N 00H 01H 00H
<1>
<2>
Level inversion,
match interrupt occurrence,
8-bit timer counter clear
<2>
Level inversion,
match interrupt occurrence,
8-bit timer counter clear
<3>
Interval time
<1> When the TMHEn bit is set to 1, the count operation is enabled. The count clock starts counting no more
than one clock after operation has been enabled.
<2> When the count value of 8-bit timer counter Hn and the set value of the CMPn0 register match, the value
of 8-bit timer counter Hn is cleared, the TOHn output level is inverted, and the INTTMHn signal is output
at the rising edge of the count clock.
<3> The INTTMHn signal and TOHn output are set to the default level when the TMHEn bit is cleared to 0
during 8-bit timer Hn operation. If the level is already at the default level before the TMHMDn.TMHEn bit
is cleared to 0, that level is maintained.
Remarks 1. n = 0, 1
2. 01H
≤
N
≤
FEH