CY14B101Q1
CY14B101Q2
PRELIMINARYCY14B101Q3
bit is cleared on the positive edge of CS following the STORE instruction.
Figure 15. Software STORE Operation
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SI | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 |
SO |
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Software RECALL
When a RECALL instruction is executed, nvSRAM performs a Software RECALL operation. To issue this instruction, the device must be write enabled (WEN = ‘1’).
The instruction is performed by transmitting the RECALL opcode on the SI pin following the falling edge of CS. The WEN bit is cleared on the positive edge of CS following the RECALL instruction.
Figure 16. Software RECALL Operation
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SI | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
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AutoStore Disable (ASDISB)
AutoStore is enabled by default in CY14B101Q2/CY14B101Q3. The ASDISB instruction disables the AutoStore. This setting is not nonvolatile and needs to be followed by a STORE sequence to survive the power cycle.
To issue this instruction, the device must be write enabled (WEN
=‘1’). The instruction is performed by transmitting the ASDISB opcode on the SI pin following the falling edge of CS. The WEN bit is cleared on the positive edge of CS following the ASDISB instruction.
Figure 17. AutoStore Disable Operation
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SI | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 |
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AutoStore Enable (ASENB)
The AutoStore Enable instruction enables the AutoStore on CY14B101Q1. This setting is not nonvolatile and needs to be followed by a STORE sequence to survive the power cycle.
To issue this instruction, the device must be write enabled (WEN
=‘1’). The instruction is performed by transmitting the ASENB opcode on the SI pin following the falling edge of CS. The WEN bit is cleared on the positive edge of CS following the ASENB instruction.
Note If ASDISB and ASENB instructions are executed in CY14B101Q1, the device is busy for the duration of software sequence processing time (tSS). However, ASDISB and ASENB instructions have no effect on CY14B101Q1 as AutoStore is internally disabled.
Figure 18. AutoStore Enable Operation
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SI | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 |
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HOLD Pin Operation
The HOLD pin is used to pause the serial communication. When the device is selected and a serial sequence is underway, HOLD is used to pause the serial communication with the master device without resetting the ongoing serial sequence. To pause, the HOLD pin must be brought LOW when the SCK pin is LOW. To resume serial communication, the HOLD pin must be brought HIGH when the SCK pin is LOW (SCK may toggle during HOLD). While the device serial communication is paused, inputs to the SI pin are ignored and the SO pin is in the high impedance state.
This pin can be used by the master with the CS pin to pause the serial communication by bringing the pin HOLD LOW and deselecting an SPI slave to establish communication with another slave device, without the serial communication being reset. The communication may be resumed at a later point by selecting the device and setting the HOLD pin HIGH.
Figure 19. HOLD Operation
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Document #: | Page 12 of 22 |
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