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M48T86 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M48T86
Description  5V PC REAL TIME CLOCK
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M48T86 Datasheet(HTML) 5 Page - STMicroelectronics

 
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M48T86
RST (Reset Input). The M48T86 is reset when
the RST input is pulled low. With a valid VCC ap-
plied and a low on RST, the following events oc-
cur:
1. Periodic Interrupt Enable (PIE) bit is cleared to
a zero. (Register B; Bit 6)
2. Alarm Interrupt Enable (AIE) bit is cleared to a
zero.(Register B; bit 5)
3. Update Ended Interrupt Request (UF) bit is
cleared to a zero. (Register C; Bit 4)
4. Interrupt Request (IRQF) bit is cleared to a zero.
(Register C Bit 7)
5. Periodic Interrupt Flag (PF) bit is cleared to a
zero. (Register C; Bit 6)
6. The device is not accessible until RST is re-
turned high.
7. Alarm Interrupt Flag (AF) bit is cleared to a zero.
(Register C; Bit 5)
8. The IRQ pin is in the high impedance state.
9. Square Wave Output Enable (SQWE) bit is
cleared to zero. (Register B; Bit 3).
10.Update Ended Interrupt Enable (UIE) is cleared
to a zero. (Register B; Bit 4)
RCL (RAM Clear). The RCL pin is used to clear
all 114 storage bytes, excluding clock and control
registers, of the array to FF(hex) value. The array
will be cleared when the RCL pin is held low for at
least 100ms with the oscillator running. Usage of
this pin does not affect battery load. This function
is applicable only when VCC is applied.
R/W (Read/Write Input). The R/W pin is utilized
to latch data into the M48T86 and provides func-
tionality similar to W in other memory systems.
ADDRESS MAP
The address map of the M48T86 is shown in Fig-
ure 9. It consists of 114 bytes of user RAM, 10
bytes of RAM that contain the RTC time, calendar
and alarm data, and 4 bytes which are used for
control and status. All bytes can be read or written
to except for the following:
1. Registers C & D are read-only.
2. Bit 7 of Register A is read-only.
The contents of the four Registers A, B, C, and D
are described in the "Registers" section.


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