Product Specifications

CY8C29466/CY8C29566
CY8C29666/CY8C29866
Document Number: 38-12013 Rev. AB Page 62 of 67
// dummy read from each 8 K Flash bank
// bank 1
mov A, 0x20 // MSB
mov X, 0x00 // LSB
romx
// bank 2
mov A, 0x40 // MSB
mov X, 0x00 // LSB
romx
// bank 3
mov A, 0x60 // MSB
mov X, 0x00 // LSB
romx
// wait at least 5 µs
mov X, 14
loop1:
dec X
jnz loop1
2. Internal main oscillator (IMO) tolerance deviation at temperature extremes
■ Problem Definition
Asynchronous digital communications interfaces may fail framing beyond 0 to 70 °C. This problem does not affect end-product
usage between 0 and 70 °C.
■ Parameters Affected
The IMO frequency tolerance. The worst case deviation when operated below 0 °C and above +70 °C and within the upper and
lower datasheet temperature range is ±5%.
■ Trigger Condition(S)
The asynchronous Rx/Tx clock source IMO frequency tolerance may deviate beyond the data sheet limit of ±2.5% when operated
beyond the temperature range of 0 to +70 °C.
■ Scope of Impact
This problem may affect UART, IrDA, and FSK implementations.
■ Workaround
Implement a quartz crystal stabilized clock source on at least one end of the asynchronous digital communications interface.
■ Fix Status
Silicon fix is not planned. The workaround mentioned above should be used.