isp1181a NXP Semiconductors, isp1181a Datasheet - Page 44

• Manufacturer Part Number: isp1181a
• Description: Isp1181a Full-speed Universal Serial Bus Peripheral Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13959
Product data
Fig 12. Oscillator and LazyClock logic.
Fig 13. CLKOUT signal timing at ‘suspend’ and ‘resume’.
If enabled, the 100 kHz
SUSPEND
GOSUSP
WAKEUP
CLKOUT
CLKDIV [ 3:0 ]
configuration
CLKRUN
NOLAZY
hardware
register
.
.
.
.
.
.
50 % LazyClock frequency will be output on pin CLKOUT during ‘suspend’ state.
SUSPEND
When ISP1181A enters ‘suspend’ state (by setting and clearing bit GOSUSP in the
Mode Register), outputs SUSPEND and CLKOUT change state after approximately
2 ms delay. When NOLAZY = 0, the clock signal on output CLKOUT does not stop,
but changes to the 100 kHz
When resuming from ‘suspend’ state by a positive pulse on input WAKEUP, output
SUSPEND is cleared and the clock signal on CLKOUT is restarted after a 0.5 ms
delay. The timing of the CLKOUT signal at ‘suspend’ and ‘resume’ is given in
Figure
13.
1.8 to 2.2 ms
Rev. 05 — 08 December 2004
XTAL OSC
4
enable
6 MHz
50 % LazyClock frequency.
LAZYCLOCK
PLL 8
enable
enable
48 MHz
100 (±50 %) kHz
Full-speed USB peripheral controller
0.5 ms
(N + 1)
N
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
PLL circuit stable
3 to 4 ms
MGS775
1
0
NOLAZY
ISP1181A
CLKOUT
MGS776
44 of 70