SH3003 Datasheet, PDF (21/30 Pages) Semtech Corporation – MicroBuddy® Support IC for Microcontrollers

SH3003
POWER MANAGEMENT
Application Information (continued)
Interrupt and Serial Interface (continued)
Minimum Bit Period
CLKOUT Frequency (host synchronous to CLKOUT)
16MHz
8MHz
2MHz
250ns
500ns
2μs
Minimum Bit Period
(host Asynchronous to
CLKOUT)
3.25μs
6.5μs
26μs
Maximum Bit Period
63.9μs
127μs
511μs
Table 3 - Minimum/Maximum Serial Bit Timing
Interrupt Interface
The serial communications line to the SH3003 (Pin 14, IO/Int) also serves as the interrupt to the host microcontroller.
The polarity of the interrupt is software programmable using the interrupt polarity bit (bit 6) of the IPol_RCtune register
(R0x11). This pin is asserted for four cycles of CLKout, and then returns to the inactive state.
The interrupt line is used by the Periodic Interrupt/Wake-up Timer to interrupt the host when it reaches its end of
count.
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