UPD77113A 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD77113A

16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSORS

NEC => Renesas Technology 

µPD77113A, 77114

5.1.1 Self boot

The boot-up ROM transfers the instruction code stored in the data memory space to the instruction RAM, based

on the boot parameter written to address 0x4000 of the Y data memory. Generally, with a mask ROM model, this

function is implemented by storing the instructions to be booted in the data ROM.

In addition, the instructions to be booted can be also stored in an external data area in the form of flash ROM, and

self boot can be executed from this external data area.

5.1.2 Host boot

In this boot mode, a boot parameter and instruction code are obtained via the host interface, and transferred to the

instruction RAM.

5.2 Reboot

By calling the next reboot entry from the program, the contents of the instruction RAM can be rewritten.

Self boot

Host boot

Reboot Mode

X memory

Y memory

Host reboot

Word reboot

Byte reboot

Word reboot

Byte reboot

Entry Address

0x2

0x4

0x1

0x3

0x5

5.2.1 Self reboot

The instruction codes stored in the data memory are transferred to the instruction RAM.

Set the following parameters and call the entry address of the corresponding reboot mode to execute self reboot.

• R7L : Number of instruction steps for rebooting

• DP3: First address of X memory in which instruction codes are stored (in the case of reboot from X memory),

or first address of the instruction memory to be loaded (in the case of reboot from Y memory)

• DP7: First address of instruction memory to be loaded (in the case of reboot from X memory), or first address

of X memory in which instruction codes are stored (in the case of reboot from Y memory)

5.2.2 Host reboot

An instruction code is obtained via the host interface and transferred to the instruction RAM.

The entry address of is 0x5. Host reboot is executed by calling this address after setting the following parameter:

• R7L : Number of instruction steps for rebooting

• DP3: First address of instruction memory to be loaded

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Data Sheet U14373EJ3V0DS

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