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SH79F6488P/080PR bảng dữ liệu(PDF) 40 Page - SINOWEALTH Electronic Ltd

tên linh kiện SH79F6488P/080PR
Giải thích chi tiết về linh kiện  Enhanced 8051 Microcontroller with 20bit Σ-ΔADC and LCD Driver
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nhà sản xuất  SINOWEALTH [SINOWEALTH Electronic Ltd]
Trang chủ  https://en.sinowealth.com
Logo SINOWEALTH - SINOWEALTH Electronic Ltd

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SH79F6488/SH79F6489
40
7.6 System Clock Monitor (SCM)
In order to enhance the system reliability, SH79F6488/SH79F6489 contains a system clock monitor (SCM) module. If the
system clock fails (for example the oscillator stops oscillating), the built-in SCM will switch the OSCCLK to the internal 32k
WDTCLK and set system clock monitor bit (SCMIF) to 1. And the SCM interrupt will be generated when EA and ESCM is
enabled. If the OSCCLK comes back, SCM will switch the OSCCLK back to the oscillator and clears the SCMIF automatically.
Notes:
The SCMIF is read only register; it can be clear to 0 or set to 1 by hardware only.
If SCMIF is cleared, the SCM switches the system clock to the state before system clock fail automatically.
If Internal RC is selected as OSCCLK by code option (Refer to code option section for detail), the SCM can not work.
Table 7.20 System Clock Control Register
B2H
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
CLKCON
-
-
-
SCMIF
-
-
-
-
R/W
-
-
-
R
-
-
-
-
Reset Value
(POR/WDT/LVR/PIN)
-
-
-
0
-
-
-
-
Bit Number
Bit Mnemonic
Description
4
SCMIF
System Clock Monitor bit
0: Clear by hardware to indicate system clock is normal
1: Set by hardware to indicate system clock fails



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