isp1181 NXP Semiconductors, isp1181 Datasheet - Page 45

• Manufacturer Part Number: isp1181
• Description: Isp1181 Full-speed Universal Serial Bus Interface Device
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 08938
Product data
Fig 13. Oscillator and LazyClock logic.
Fig 14. CLKOUT signal timing at ‘suspend’ and ‘resume’.
If enabled, the 115 kHz 10 % LazyClock frequency will be output on pin CLKOUT during ‘suspend’ state.
SUSPEND
GOSUSP
WAKEUP
configuration
CLKOUT
CKDIV [ 3:0 ]
hardware
CLKRUN
NOLAZY
register
.
.
.
.
.
.
SUSPEND
When ISP1181 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 115 kHz 10 % LazyClock frequency.
When resuming from ‘suspend’ state by a positive pulse on input WAKEUP, output
SUSPEND is cleared and the clock signal on CLKOUT restarted after a 0.5 ms delay.
The timing of the CLKOUT signal at ‘suspend’ and ‘resume’ is given in
1.8 to 2.2 ms
XTAL OSC
4
Rev. 04 — 30 October 2001
enable
6 MHz
LAZYCLOCK
PLL 8
enable
enable
48 MHz
115 (±10%) kHz
0.5 ms
(N + 1)
N
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
PLL circuit stable
3 to 4 ms
MGS775
Full-speed USB interface
0
1
NOLAZY
CLKOUT
ISP1181
MGS776
Figure
14.
45 of 71