Nbd Function; Ram Monitoring, Accessing Nbd Space - NEC V850E/IA1 mPD703116 User Manual

32-bit single-chip microcontrollers

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12.4 NBD Function

The NBD function performs read and write operations on internal RAM data via DMA (direct memory access) for

addresses in internal RAM. It also performs reading or writing to NBD space.

(1) RAM monitoring

The following are the commands for reading and writing to internal RAM areas from the NBD tool.

(a) Write command

The target address (real address of target: lower 24 bits) at which a write to internal RAM is to be made

and the data are received from the NBD tool as a command packet. After receiving the command packet

shown below from the NBD tool, a Ready command is output following write termination.

Command packets can be received once more from the NBD tool (after Ready command SYNC inactive

confirmation).

(b) Read command

The target address (real address of target: lower 24 bits) at which a read of internal RAM is to be made is

received from the NBD tool as a command packet. After receiving the command packet from the NBD

tool, a Ready command is output, SYNC is made inactive, and the data at the address specified by the

command packet is transmitted to the NBD tool. The address (A27 to A24) during read is "1111".

Caution In read mode, the output data section from the NBD tool is deleted.

CHAPTER 12 NBD FUNCTION ( µ µ µ µ PD70F3116)

Table 12-3. Command Packet (On a Write)

Target space write address specification (24 bits)

Write data (data specified by SIZ0 and SIZ1)

Table 12-4. Command Packet (On a Read)

Target space read address specification (24 bits)

Table 12-5. Data Packet (On a Read)

Target space read data

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