HCS08 datasheet(303/374 Pages) NXP

303 / 374 page

Universal Serial Bus Device Controller (S08USBV1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

303

17.3.7

Error Interrupt Status Register (ERRSTAT)

The ERRSTAT contains bits for each of the error sources within the USB module. Each of these bits

corresponds to its respective error enable bit (See Section 17.3.8, “Error Interrupt Enable Register

(ERRENB)”.) The result is OR'ed together and sent to the ERROR bit of the INTSTAT register. Once an

interrupt bit has been set, it may only be cleared by writing a 1 to the corresponding flag bit. Each bit is

set as soon as the error condition is detected. Thus, the interrupt will typically not correspond with the end

of a token being processed. This register will contain the value of 0x00 after reset.

ERROR

ERROR Interrupt Enable — Setting this bit will enable ERROR interrupts.

0 Interrupt disabled

1 Interrupt enabled

USBRST

USBRST Interrupt Enable — Setting this bit will enable USBRST interrupts.

0 Interrupt disabled

1 Interrupt enabled

321

BTSERRF

Reserved

BUFERRF

BTOERRF

DFN8F

CRC16F

CRC5F

PIDERRF

Reset

000

Figure 17-10. Error Interrupt Status Register (ERRSTAT)

Table 17-11. ERRSTAT Field Descriptions

Field

Description

BTSERRF

Bit Stuff Error Flag — A bit stuff error has been detected. If set, the corresponding packet will be rejected due

to a bit stuff error.

0 No bit stuff error detected

1 Bit stuff error flag set

BUFERRF

Buffer Error Flag — This bit is set if the USB module has requested a memory access to read a new BD but

has not been given the bus before the USB module needs to receive or transmit data. If processing a TX (IN

endpoint) transfer, this would cause a transmit data underflow condition. Or if processing an Rx (OUT endpoint)

transfer, this would cause a receive data overflow condition. This bit is also set if a data packet to or from the host

is larger than the buffer size that is allocated in the BD. In this case the data packet is truncated as it is put into

buffer memory.

0 No buffer error detected

1 A buffer error has occurred

BTOERRF

Bus Turnaround Error Timeout Flag — This bit is set if a bus turnaround timeout error has occurred. The USB

module uses a bus turnaround timer to keep track of the amount of time elapsed between the token and data

phases of a SETUP or OUT TOKEN or the data and handshake phases of an IN TOKEN. If more than 16-bit

times are counted from the previous EOP before a transition from IDLE, a bus turnaround timeout error will occur.

0 No bus turnaround timeout error has been detected

1 A bus turnaround timeout error has occurred

Table 17-10. INTENB Field Descriptions (continued)

Field

Description

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