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How is data bus and control signal after a power-on reset in Boot mode?

Latest Updated:09/10/2007

Question:

How is the state of the address/data bus and bus control signal immediately after a power-on reset in Boot mode?

Answer:

The pins for the address/data bus and bus control signal are multiplexed with the input/output ports, on-chip peripheral functions and so on. In Boot mode, the following pin functions are initially selected depending on the status of the MD0 and MD1 pins. 

(a)MD1=0,MD0=0
  Initial pin function of MCU extension mode 2(Built-in ROM effective)
(b)MD1=0,MD0=1
  Initial pin function of Single chip mode

Please refer to the chapter of the pin function controller (PFC) in the hardware manual of each product on the initial pin function.
Please also refer to the appendix (pin status) in the hardware manual of each product on the initial pin status.
Suitable Products
SH7144, SH7145
SH7055
SH7052, SH7053, SH7054
SH7047, SH7049, SH7105, SH7107, SH7109