h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 392
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h8s-2172
Manufacturer Part Number
h8s-2172
Description
Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2172.pdf
(570 pages)
- Current page: 392 of 570
- Download datasheet (5Mb)
To control this, the USB suspend interrupt (USBI2) which notifies that the USB module enters or
recovers the suspend state to the CPU and a register bit (USUSOUT bit in USBSUSP) which
controls the external USSUSP output are provided.
Figure 12.16 shows the enter/recover sequence of suspend mode. And the following 1 to 6
descriptions explain the operation at its each point.
1. USBSUSP Output Mask
2. Entering Suspend State by USB Module
3. USB Suspend Interrupt (USBI2)
Rev. 2.00, 03/04, page 360 of 534
USBI2 interrupt request
Internal suspend signal
When the USUSOUT bit in USBSUSP is cleared to 0, output of the USSUSP pin is masked
(fixed to 1) and notification of the suspend state to the external transceiver is disabled.
If the USB continues to be idle for the specified time, the USB module asserts the internal
suspend signal and enters the suspend state. Since the USSUSP output is masked by means of
the USUSOUT bit in USBSUSP, the external pin, USSUSP, is not changed.
When the USUSFGE bit in USBSUSP is set to 1 and the internal suspend signal of the USB
module is changed, an interrupt (USBI2) can be requested to the CPU.
As the initial setting, the USUSFG bit (interrupt flag) in USBSUSP should be cleared to 0 and
then the USUSFGE bit in USBSUSP should be set to 1.
The USBI2 interrupt request occurs when the internal suspend signal of the USB module is
changed. After the interrupt flag is cleared in the interrupt routine, monitor the USUSMONI bit
in USBSUSP and confirm that the interrupt occurs because of transition to the suspend state.
Note that an interrupt occurs when transition is made in the following order: normal mode,
suspend mode, and normal mode.
Initial setting
mask signal
USCLK
:
[1]
Figure 12.16 Enter/Recover Sequence of USB Suspend State
signal mask period
[2]
[3]
Interrupt
flag
cleared
[4]
[5]
[6]
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