DF2218BR24V Renesas Electronics America, DF2218BR24V Datasheet - Page 573

• Manufacturer Part Number: DF2218BR24V
• Description: IC H8S/2218 MCU FLASH 112-LFBGA
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2200r

Specifications of DF2218BR24V

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 24MHz
• Connectivity: SCI, SmartCard, USB
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 12K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-LFBGA
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)3DK2218-SS - KIT DEV H8S/2218 WINDOWS SIDESHW3DK2218 - DEV EVAL KIT H8S/2218
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

14.5.9
(1) Overview
(2) Forcible Stall by Firmware
This section describes stall operations in the USB function module. There are two cases in
which the USB function module stall function is used:
Α. When the firmware forcibly stalls an endpoint for some reason
Β. When a stall is performed automatically within the USB function module due to a USB
The USB function module has internal status bits that hold the status (stall or non-stall) of each
endpoint. When a transaction is sent from the host, the module refers these internal status bits
and determines whether to return a stall to the host. These bits cannot be cleared by the
firmware; they must be cleared with a Clear Feature command from the host. However, the
internal status bit for EP0 is cleared automatically at the reception of the setup command.
The firmware uses the UESTL register to issue a stall request for the USB function module.
When the firmware wishes to stall a specific endpoint, it sets the corresponding EPnSTL bit (1-
1 in figure 14.20). The internal status bits are not changed at this time.
When a transaction is sent from the host for the endpoint for which the EPnSTL bit was set, the
USB function module refers the internal status bit, and if this is not set, refers the
corresponding EPnSTL bit (1-2 in figure 14.20). If the corresponding EPnSTL bit is not set, the
internal status bit is not changed and the transaction is accepted. If the corresponding EPnSTL
bit is set, the USB function module sets the internal status bit and returns a stall handshake to
the host (1-3 in figure 14.20).
Once an internal status bit is set, it remains set until cleared by a Clear Feature command from
the host, without regarding to EPnSTL. Even after a bit is cleared by the Clear Feature
command (3-1 in figure 14.20), the USB function module continues to return a stall handshake
while the EPnSTL bit is set, since the internal status bit is set each time a transaction is
executed for the corresponding endpoint (1-2 in figure 14.20). To clear a stall, therefore, it is
necessary for the corresponding EPnSTL bit to be cleared by the firmware, and also for the
internal status bit to be cleared with a Clear Feature command (2-1 to 2-3 in figure 14.20).
specification violation.
Stall Operations
Rev.7.00 Dec. 24, 2008 Page 517 of 698
REJ09B0074-0700