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參數資料
| 型號： | LA6513A |
| 文件頁數： | 18/24頁 |
| 文件大小： | 332K |
| 代理商： | LA6513A |
LC6512A, LC6513A
No.2367–18/24
4-7-4. Notes for circuit design
How to fix C3, R6, C2, R2
Fix closed loop (A) discharge time constants C3, R6 and HOLD pin charge time constants C2, R2 so that closed
loop (A) fully discharges before the HOLD input voltage gets lower than V
IL
at the time of instantaneous break and
the RES input voltage is sure to get lower than V
IL
(a reset occurs) when V+ rises after instantaneous break where
the HOLD input voltage gets lower than V
IL
.
How to fix C3, R7
Fix RES pin charge time constants C3, R7 so that when power is applied initially or the HOLD mode is released the
ceramic resonator OSC oscillates normally and the RES input voltage exceeds V
IH
and the program starts running.
￡
How to fix R4, R5
Fix Tr bias constants R4, R5 so that when V+ rises after instantaneous break the RES input voltage gets lower than
V
IL
(brought to L-Level) before the HOLD input voltage exceeds V
IH
(brought to H- Level).
￠
How to fix C2, R3
Fix HOLD pin charge time constants C2, R3 so that when the HOLD mode is released from the backup mode the
HOLD input voltage does not exceed V
OH
(not brought to H-Level) until the RES input voltage gets lower than V
IL
(brought to L-Level).
Fix C3, R7 and C2, R3 so that the time interval from the moment the HOLD input voltage exceeds V
IH
until the
moment the RES input voltage exceeds V
IH
is longer than the ceremic resonator OSC stabilizing time.
∞
When the load is heavy or the polling interval is long
Since Cl discharges largely, increase the capacity of C1 or separate (B) detection from V+ and use a power supply
or signal that rises faster than V+.
4-7-5. Notes for software design
When the HOLD request signal is detected, the HALT instruction is executed immediately. A concrete example is
shown below.
(1) An interrupt is inhibited before polling the HOLD request pin (HOLD pin).
(2) Polling of the HOLD pin and the HALT instruction are programmed consecutively.
[ Concrete example ]
…
RCTL 3 ;EXTEN, TMEN
←
0 (External, timer interrupt inhibit)
BP0 AAA ;Polling of the HOLD pin (If H-Level, a branch occurs to AAA.)
HALT ;The HOLD mode is entered.
…
AAA:
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