isp1161bm NXP Semiconductors, isp1161bm Datasheet - Page 84

• Manufacturer Part Number: isp1161bm
• Description: Isp1161 Full-speed Universal Serial Bus Single-chip Host And Device Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 09567
Product data
Fig 39. Suspend and resume timing for powered-off application (DC side).
D_SUSPEND
D_WAKEUP
GOSUSP
11.4.2 Powered-off application
In powered-off application (bit PWROFF = 1 in the DcHardwareConfiguration
register) the supply of the CPU and other parts of the circuit is removed during
‘suspend’ state. The D_SUSPEND output is active HIGH during ‘suspend’ state,
making it suitable as a power switch control signal, e.g. for an external oscillator.
Input pins of ISP1161’s DC are pulled to ground via the pin buffers. Outputs are made
three-state to prevent current flowing in the application. Bi-directional pins are made
three-state and must be pulled to ground externally by the application. The power
supply of external pull-ups must also be removed to reduce power consumption.
Table 69:
[1]
When external components are powered-off, it is possible that interface signals RD,
WR and CS have unknown values immediately after leaving ‘suspend’ state. To
prevent corruption of its internal registers, ISP1161’s DC enables a locking
mechanism once suspend is enabled.
Pin
A0
D[15:0]
D_SUSPEND
D_WAKEUP
INT2
RESET
CS
RD
WR
XTAL1
CLKOUT
5. When the firmware has set and cleared the GOSUSP bit in the DcMode register,
the ISP1161’s DC enters ‘suspend’ state. In powered-off application, the
ISP1161’s DC asserts output D_SUSPEND and switches off the internal clocks
(except LazyClock) after 2 ms.
Externally driven refers to logic outside the ISP1161’s DC.
2 ms
Pin states in powered-off application
Rev. 02 — 13 December 2002
Type
I
I/O (three-state)
O
I
O
I
I
I
I
I
O
Full-speed USB single-chip host and device controller
Appropriate state
inactive
ISP1161’s DC drives logic 1
inactive
powered off; internally connected to ground (logic 0)
externally driven
powered off; internally connected to ground (logic 0)
powered off; internally connected to ground (logic 0)
powered off; internally connected to ground (logic 0)
powered off; internally connected to ground (logic 0)
ISP1161’s DC drives logic 0, if the NOLAZY bit is set to
logic 1 in the DcHardwareConfiguration register
0.5 ms
[1]
to logic 1
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
ISP1161
004aaa032
84 of 137