R5S72011 RENESAS [Renesas Technology Corp], R5S72011 Datasheet - Page 326
R5S72011
Manufacturer Part Number
R5S72011
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5S72011.pdf
(1196 pages)
- Current page: 326 of 1196
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Section 10 Bus Monitor
10.2.3
The bus timeout detection function detects bus accesses whose cycles are extended to 768 cycles
or more.
(1)
Bus timeout errors occur in the following cases. This function should be used when debugging
software.
• A bus access is not completed on peripheral bus (1)
• The WAIT signal remains asserted during an external bus access
(2)
The operation when a bus timeout error occurs is explained below.
1. The timeout counter starts counting from the next cycle after the start of a bus access.
2. If the bus access is not completed in 768 cycles, a bus timeout occurs and an access canceling
3. The bus access is terminated.
4. The CPU processes the bus error.
Rev. 2.00 Sep. 07, 2007 Page 298 of 1164
REJ09B0321-0200
signal is asserted for 256 cycles.
Bus signals such as address, data, BC, read/write, and burst are held.
The timeout error is recorded in the bus monitor status register 1 (SYCBESTS1) or bus
monitor status register 2 (SYCBESTS2).
A bus error interrupt is generated and sent to the CPU.
Locked buses are all released.
Conditions of Bus Timeout Error Generation
Operation When a Bus Timeout Error is Generated
Bus Timeout Detection Function
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