DS1077Z-125 Maxim Integrated Products, DS1077Z-125 Datasheet - Page 5

• Manufacturer Part Number: DS1077Z-125
• Description: Timers & Support Products EconOscillator-Divid onOscillator-Divider
• Manufacturer: Maxim Integrated Products

SHUTDOWN CONTROL WITH PDN0 AND PDN1 Table 3
*CTRL0 performs a power-down if SEL0 and EN0 are both 0 (see Table 1).
REGISTER FUNCTIONS
The user programmable registers can be programmed by the user to determine the mode of operation
(MUX), operating frequency (DIV), and bus settings (BUS). Details of how these registers are
programmed can be found in a later section; in this section the functions of the registers are described.
The register settings are nonvolatile, the values being stored automatically or as required in EEPROM
when the registers are programmed via the SDA and SCL pins.
MUX WORD
*This bit must be set to zero.
DIV1 (bit)
This bit allows the output of the Prescaler P1 to be routed directly to the OUT1 pin (DIV1 = 1). The N
divider is bypassed so the programmed value of N is ignored. If DIV1 = 0 (default) the N divider
functions normally.
0M1, 0M0, 1M1, 1M0 (bits)
These bits set the prescalers P0 and P1, to divide by 1, 2, 4, or 8 (see Table 4).
PRESCALER DIVISOR M SETTINGS Table 4
**Default Condition
Name
Default
setting
PDN0
(BIT)
0M1
0
0
1
1
0
0
1
1
MSB
* PDN1
0
PDN1
(BIT)
0M0
0
0
1
0
1
0
1
0
1
PDN0
P0 Divisor
Prescaler
0
“M”
SHUTDOWN CONTROL
1**
2
4
8
SEL0 EN0
CTRL0 OR CTRL1
1
first data byte
NONE*
CTRL1
CTRL0
1M1
0
0
1
1
1
0M1
5 of 21
0
1M0
0
1
0
1
0M0
0
P1 Divisor
Prescaler
“M”
LSB
1M1
1**
2
4
8
0
1M0 DIV1 - - -
MSB
0
0
second data byte
x x x x x x
- - -
LSB