S-7760A Datasheet, PDF (18/53 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
S-7760A
Rev.1.3_00
„ Timing of Data Loading from E²PROM and Timer Action
The example of timing chart of data loading from the E²PROM and timer action is shown in Figure 19 and 20.
Set V_CCH ≥ 2.5 V when rising VCCH and TIMEN simultaneously.
Power supply voltage
V_CCH / V_CCL
Signal of low power
supply voltage
detection
TIMEN pin
2.05 V Typ.
Data loading
Start of timer action due to power-on
Start of timer action by setting
TIMEN pin “L” → “H”
Start of timer action by Write in
timer enable register
Oscillation circuit
EN
DO3 pin
(When E²PROM
CTR3 = 0)
CTR3 register
(When E²PROM
CTR3 = 0)
Time out
Delay time by timer setting with DO3
Time out
Delay time by timer setting with DO3
Time out
Delay time by timer setting with DO3
Reload starts
Delay time by timer setting with DO2
Delay time by timer setting with DO2
Delay time by timer setting with DO2
DO2 pin
(When E²PROM
CTR2 = 1)
CTR2 register
(When E²PROM
CTR2 = 1)
Reload starts
Period to define data^*1
*1. A period to define data is; the loading period from E²PROM + the period to stabilize output from DO7 to 0 pin = within
100 µs.
Figure 19 Data Loading and Timer Action Example 1
18
Seiko Instruments Inc.