CHAPTER 15: SD Card Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 861
2.17 Normal Interrupt Status Register
The Normal Interrupt Status Enable Register affects the read access to this register, but the Normal
Interrupt Signal Enable Register does not. An interrupt is generated when its interrupt signal is enabled by
its corresponding bit in the Normal Interrupt Signal Enable Register and its corresponding interrupt status
bit in this register is set to 1.
*1: The Card Removal bit is set to 1 after the Card Removal Status Enable bit in the Normal Interrupt
Status Enable Register has been set to 1 and the Card Inserted bit in the Present State Register has
changed its value. The Card Insertion bit is set to 1 after the Card Insertion Status Enable bit in the
Normal Interrupt Status Enable Register has been set to 1 and the Card Inserted bit in the Present
State Register has changed its value.
For example, with the Card Inserted bit in the Present State Register set to 1, even if the Card
Insertion
Status Enable bit in the Normal Interrupt Status Enable Register is set to 1, the Card Insertion bit does
not become 1. Therefore, always check the setting of the Card Inserted bit in the Present State
Register when deciding whether to execute the interrupt wait process.
*2: The Card Interrupt bit can be cleared to 0 by setting the Card Interrupt Status Enable bit in the Normal
Interrupt Status Enable Register to 0.
When using the SD card interface, always set the Card Interrupt Status Enable bit in the Normal
Interrupt
Status Enable Register to 0 to clear the Card Interrupt bit before receiving a succeeding interrupt from
the SD card.
For other details of this register, refer to SD Specifications Part A2.
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