Skip to main content
Knowledgebase
Home
Renesas Singapore - Knowledgebase

Long-word instruction for CPU: does CS signal output "L"?

Latest Updated:02/14/2006

Question:

When the CPU executes a long-word instruction , does the CS signal output a "L" consecutively for the upper and lower words?

Answer:

When two addresses located in the same CS area are output consecutively (upper word data and lower word data are written in consecutive cycles), a "L" CS signal is output. However, these accesses do not always happen consecutively in the order, lower word data and then upper word data.
In other cases, a program fetch cycle or a DMA cycle might be inserted between these accesses. In this situation, a "L" CS signal is not output.
Suitable Products
M32C/8A
M32C/88
M32C/87
M32C/85
M32C/84
M32C/83
M32C/80
  • Was this article helpful?