MM58167 NSC [National Semiconductor], MM58167 Datasheet - Page 4

• Manufacturer Part Number: MM58167
• Description: Microprocessor Real Time Clock
• Manufacturer: NSC [National Semiconductor]

Functional Description
All others unused
The comparator is a cascaded exclusive NOR Its output is
latched 61 s after the rising edge of the 1 kHz clock signal
(input to the milliseconds counter) This allows the counter
to ripple through before looking at the comparator For oper-
ation at less than 4 5V the thousandths of seconds counter
should not be included in a compare because of the possi-
bility of having a ripple delay greater than 61 s (For output
timing see Interrupt Timing )
Milliseconds
Hundredths and
Tenths of Seconds
Seconds
Minutes
Hours
Day of Week
Day of Month
Months
A4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Function
A3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
TABLE II Clock RAM Bit Map for Alarm Interrupt Everyday at 10 15 a m
4
0
0
0
0
0
0
0
0
A2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
3
1
1
1
1
1
1
1
1
Address
(Continued)
TABLE III Address Codes and Function
2
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
4
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
7
0
0
0
0
0
1
1
Power Down Mode
The POWER DOWN input is essentially a second chip se-
lect It disables all inputs and outputs except for the
STANDBY INTERRUPT When this input is at a logical zero
the device will not respond to any external signals It will
however maintain timekeeping and turn on the STANDBY
INTERRUPT if programmed to do so (The programming
must be done before the POWER DOWN input goes to a
No RAM Exists
6
0
0
0
0
0
1
1
Hi Nibble
Counter Milliseconds
Counter Hundredths and Tenths of Seconds
Counter Seconds
Counter Minutes
Counter Hours
Counter Day of Week
Counter Day of Month
Counter Month
RAM Milliseconds
RAM Hundredths and Tenths of Seconds
RAM Seconds
RAM Minutes
RAM Hours
RAM Day of Week
RAM Day of Month
RAM Months
Interrupt Status Register
Interrupt Control Register
Counters Reset
RAM Reset
Status Bit
GO Comand
STANDBY INTERRUPT
Test Mode
X
X
5
0
0
0
0
0
X
X
4
0
0
0
1
1
Data
Function
3
0
0
0
0
1
1
1
No RAM Exists
Lo Nibble
2
0
0
1
0
1
1
1
1
0
0
0
0
X
X
X
0
0
0
1
0
X
X
X