I-86
EPSON
S1C6S3N2 TECHNICAL HARDWARE
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (SVD Circuit and Heavy Load Protection Function)
0. Set HLMOD to "1" (only when the CPU system clock is
f
OSC3
in S1C6S3A2)
1. Set BLS to "1"
2. Maintain at 100 µs minimum
3. Set BLS to "0"
4. Read out BLD
5. Set HLMOD to "0" (only when the CPU system clock is
f
OSC3
in S1C6S3A2)
However, when a crystal oscillation clock (f
OSC1
) is selected
for the CPU system clock in S1C6S3N2, S1C6S3L2,
S1C6S3B2 and S1C6S3A2, the instruction cycles are long
enough, so that there is no need for concern about main-
taining 100 µs for the BLS = "1" with the software.
(1) It takes 100 µs from the time the SVD circuit goes ON
until a stable result is obtained. For this reason, keep
the following software notes in mind:
➀
When the CPU system clock is f
OSC1
1. When detection is done at HLMOD
After writing "1" on HLMOD, read the BLD after 1
instruction has passed.
2. When detection is done at BLS
After writing "1" on BLS, write "0" after at least 100
µs has lapsed (the following instruction can write
"0" because the instruction cycle is long enough)
and then read the BLD.
➁
When the CPU system clock is f
OSC3
(in case of
S1C6S3A2 only)
1. When detection is done at HLMOD
After writing "1" on HLMOD, read the BLD after 0.6
second has passed. (HLMOD holds "1" for at least
0.6 second)
2. When detection is done at BLS
Before writing "1" on BLS, write "1" on HLMOD first;
after at least 100 µs has lapsed after writing "1" on
BLS, write "0" on BLS and then read the BLD.
Programming notes
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