Rainbow Electronics DS17887 - Manual (Page 14)

DS17885/DS17887
14 of 38
Table 2. PERIODIC INTERRUPT RATE AND SQUARE-WAVE OUTPUT
FREQUENCY
EXTENDED
REGISTER B
SELECT BITS REGISTER A
E32k RS3 RS2 RS1 RS0
t
PI
PERIODIC
INTERRUPT RATE
SQW OUTPUT
FREQUENCY
0 0 0 0 0 None None
0 0 0 0 1 3.90625ms 256Hz
0 0 0 1 0 7.8125ms 128Hz
0 0 0 1 1 122.070µs 8.192kHz
0 0 1 0 0 244.141µs 4.096kHz
0 0 1 0 1 488.281µs 2.048kHz
0 0 1 1 0 976.5625µs 1.024kHz
0 0 1 1 1 1.953125ms 512Hz
0 1 0 0 0 3.90625ms 256Hz
0 1 0 0 1 7.8125ms 128Hz
0 1 0 1 0 15.625ms 64Hz
0 1 0 1 1 31.25ms 32Hz
0 1 1 0 0 62.5ms 16Hz
0 1 1 0 1 125ms 8Hz
0 1 1 1 0 250ms 4Hz
0 1 1 1 1 500ms 2Hz
1 X X X X * 32.768kHz
*RS3 to RS0 determine periodic interrupt rates as listed for E32k = 0.