PT7C4302 PERICOM [Pericom Semiconductor Corporation], PT7C4302 Datasheet - Page 5

• Manufacturer Part Number: PT7C4302
• Description: Real-time Clock Module (3-wire Interface)
• Manufacturer: PERICOM [Pericom Semiconductor Corporation]

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Registers
1.
Addr.
(hex)
Caution points:
*1. PT7C4302 uses 5 bits for address. It’s address byte consists of 1 + RAM/Clock select bit +5-bit addr. + Read/Write select bit.
*2. Oscillator Enable bit. When this bit is set to 1, oscillator is stopped but time count chain is still active.
*3. WP: Write Protect bit. WP bit should be cleared before attempting to write to the device.
*4. TCS: Trickle Charger Select.
*5. DS: Diode Select.
*6. RS: Resistor Select.
*7. Clock burst register address is used as clock/calendar burst mode operation address for consecutively read/write 0~7H
registers. Clock/calendar burst mode operation can continuously read 0H to maximum 7H registers in order; write 0~7H registers
in order. Less or larger than 8 bytes in clock burst write mode are ignored.
*8. RAM burst register address is used as RAM burst mode operation address for consecutively read/write 20~3EH RAM. Less
than 31 bytes in RAM burst read/write mode are valid.
*9. PT7C4302 has 31×8 static RAM for customer use. It is volatile RAM.
*10. All bits marked with "0" are read-only bits. Their value when read is always "0". All bits marked with "-" are customer
using space.
PT0225(11/05)
20~3E
00
01
02
03
04
05
06
07
08
1F
3F
Allocation of registers
*1
Seconds (00-59)
Minutes (00-59)
Hours (00-23 / 01-12)
Dates (01-31)
Months (01-12)
Days of the week (01-07)
Years (00-99)
Control
Trickle charger
Clock burst
RAM
RAM burst
*9
Function
*8
*7
/EOSC
12, /24
TCS
WP
Bit 7
Y80
0
0
0
0
-
-
-
*3
*4
*2
Bit 6
M40
TCS
Y40
S40
0
0
0
0
0
-
-
-
H20 or
Bit 5
M20
5
P /A
TCS
D20
Y20
S20
Real-time Clock Module (3-wire Interface)
0
0
0
-
-
-
Register definition
MO10
Bit 4
M10
TCS
H10
D10
Y10
S10
0
0
-
-
-
MO8
Bit 3
DS
M8
H8
D8
Y8
S8
0
0
-
-
-
*5
MO4
Bit 2
M4
W4
H4
D4
Y4
DS
S4
0
-
-
-
MO2
Bit 1
RS
M2
W2
D2
H2
Y2
S2
Data Sheet
0
-
-
-
*6
PT7C4302
MO1
Bit 0
M1
W1
H1
D1
Y1
RS
S1
0
Ver: 0
-
-
-