AT89S8253-24PSC ATMEL [ATMEL Corporation], AT89S8253-24PSC Datasheet - Page 30
AT89S8253-24PSC
Manufacturer Part Number
AT89S8253-24PSC
Description
8-bit Microcontroller with 12K Bytes Flash and 2K Bytes EEPROM
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT89S8253-24PSC.pdf
(59 pages)
- Current page: 30 of 59
- Download datasheet (2Mb)
Figure 14-8. SPI Transfer Format with CPHA = 0
Note:
Figure 14-9. SPI Transfer Format with CPHA = 1
Note:
15. Interrupts
30
*Not defined but normally MSB of character just received
*Not defined but normally LSB of previously transmitted character
AT89S8253
(FOR REFERENCE)
(FROM MASTER)
SCK (CPOL = 0)
SCK (CPOL = 1)
SS (TO SLAVE)
(FROM SLAVE)
SCK CYCLE #
The AT89S8253 has a total of six interrupt vectors: two external interrupts (INT0 and INT1),
three timer interrupts (Timers 0, 1, and 2), and the serial port interrupt. These interrupts are all
shown in
Each of these interrupt sources can be individually enabled or disabled by setting or clearing a
bit in Special Function Register IE. IE also contains a global disable bit, EA, which disables all
interrupts at once.
Note that
write a 1 to this bit position, since it may be used in future AT89 products.
Timer 2 interrupt is generated by the logical OR of bits TF2 and EXF2 in register T2CON. Nei-
ther of these flags is cleared by hardware when the service routine is vectored to. In fact, the
service routine may have to determine whether it was TF2 or EXF2 that generated the interrupt,
and that bit will have to be cleared in software.
The serial interrupt is the logical OR of bits RI and TI in register SCON and also bit SPIF in
SPSR (if SPIE in SPCR is set). None of these flags is cleared by hardware when the service rou-
tine is vectored to. The service routine may have to determine whether the UART or SPI
generated the interrupt.
MOSI
MISO
Figure
Table 15-1
*
15-1.
MSB
MSB
1
shows that bit position IE.6 is unimplemented. User software should not
2
6
6
3
5
5
4
4
4
5
3
3
6
2
2
7
1
1
8
LSB
LSB
3286L–MICRO–8/08
Related parts for AT89S8253-24PSC
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
Part Number:
Description:
At89s8253 8-bit Microcontroller With 12k Bytes Flash And 2k Bytes Eeprom
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory, 16Kbit
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontrollers
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet: