ST7260E1 STMicroelectronics, ST7260E1 Datasheet - Page 93

• Manufacturer Part Number: ST7260E1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 8K FLASH/ROM AND SERIAL COMMUNICATION INTERFACE (SCI)
• Manufacturer: STMicroelectronics

Specifications of ST7260E1

• 4 Or 8 Kbytes Program Memory: high density Flash (HDFlash), or FastROM with readout and write protection

ST7260xx
Note:
Note:
14.4.5
0: No error detected
1: Timeout, CRC, bit stuffing or nonstandard
framing error detected
Bit 3 = IOVR Interrupt overrun.
This bit is set when hardware tries to set ERR, or SOF before they have been cleared by
software.
0: No overrun detected
1: Overrun detected
Bit 2 = ESUSP End suspend mode.
This bit is set by hardware when, during suspend mode, activity is detected that wakes the
USB interface up from suspend mode.
This interrupt is serviced by a specific vector, in order to wake up the ST7 from HALT mode.
0: No End Suspend detected
1: End Suspend detected
Bit 1 = RESET USB reset.
This bit is set by hardware when the USB reset sequence is detected on the bus.
0: No USB reset signal detected
1: USB reset signal detected
The DADDR, EP0RA, EP0RB, EP1RA, EP1RB, EP2RA and EP2RB registers are reset by a
USB reset.
Bit 0 = SOF Start of frame.
This bit is set by hardware when a low-speed SOF indication (keep-alive strobe) is seen on
the USB bus. It is also issued at the end of a resume sequence.
0: No SOF signal detected
1: SOF signal detected
To avoid spurious clearing of some bits, it is recommended to clear them using a load
instruction where all bits which must not be altered are set, and all bits to be cleared are
reset. Avoid read-modify-write instructions like AND , XOR..
Interrupt mask register (IMR)
Bits 7:0 = These bits are mask bits for all interrupt condition bits included in the ISTR.
Whenever one of the IMR bits is set, if the corresponding ISTR bit is set, and the I bit in the
CC register is cleared, an interrupt request is generated. For an explanation of each bit,
please refer to the corresponding bit description in ISTR.
IMR
SUSPM
R/W
7
DOVRM
R/W
6
CTRM
R/W
5
ERRM
R/W
4
IOVRM
R/W
3
ESUSPM
R/W
2
Reset value:
USB interface (USB)
RESETM
R/W
1
0000 0000 (00h)
SOFM
R/W
0
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