m48t212a STMicroelectronics, m48t212a Datasheet - Page 16

• Manufacturer Part Number: m48t212a
• Description: 3.3v Timekeeper Controller
• Manufacturer: STMicroelectronics

M48T212A
Figure 11. Calibration Waveform
Figure 12. RSTIN1 & RSTIN2 Timing Waveforms
Note: 1. With pull-up resistor.
Table 16. Default Values
Note: 1. WDS, BMB0-BMB4, RB0, RB1.
16/20
Initial Power-up
(Battery Attach for SNAPHAT)
RESET
Power-down
Subsequent Power-up
2. State of other control bits undefined.
3. State of other control bits remains unchanged.
4. Assuming these bits set to ‘1’ prior to power-down.
(3)
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
Condition
(4)
RSTIN1
RSTIN2
RST
(1)
(2)
tR1
W
0
0
0
0
R
0
0
1
1
tR1HRH
tR2
FT
0
0
0
0
AFE
0
0
1
0
ABE
tR2HRH
0
0
1
0
AI02642
WATCHDOG
Register
AI00594B
0
0
0
0
(1)