UPD63335 Ver la hoja de datos (PDF) - NEC => Renesas Technology
Número de pieza
componentes Descripción
Fabricante
UPD63335 Datasheet PDF : 56 Pages
| |||
µ PD63335
1.6 Digital Interfaces
The µPD63335 uses two different interfaces to connect to an external host processor (such as a CPU or sound
controller). One is the serial command interface that controls the µPD63335, and the other is the serial data interface
that is used for data input and output.
Figure 1-4. Digital Interfaces
Host processor
Serial command interface
MSCLK
MSWDT
MSRDT
Serial data interface
LRCLK
BIT_CLK
SI
SO
µ PD63335
1.6.1 Serial command interface
RESET
MSCLK
MSWDT
(Input)
MSRDT
(Output)
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Address
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Write data
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Read data
When accessing the µPD63335 from an external host processor, use the clocked serial interface (MSCLK,
MSWDT, MSRDT).
Transfer of addresses begins in sync with the rising edge of MSCLK, immediately after the RESET signal goes
from low level to high level. Addresses consist of eight bits, of which bit 7 indicates the read/write attribute for
access.
When a “1” is transferred to bit 7 in the address, a read operation is performed. After an address is input via the
MSWDT pin, the contents of the corresponding register are output via the MSRDT pin.
When a “0” is transferred to bit 7 in the address, a write operation is performed. Once the address is sent from the
host processor, 8-bit data is written.
The µPD63335 uses the data to check for bit drift in the serial command interface so as to ensure accurate control
from the host processor.
When communication is being performed correctly, the D6 address bit of all the registers except the warm reset
register (7Fh) is always “0”, and the D7 and D6 data bits are always “01”. The D6 data bit (SICK) is used to check for
the occurrence of bit displacement among the serial command interface bits. For details of the SICK bit, refer to
2.1.1 Serial command interface check bit (SICK).
Data Sheet S15003EJ6V0DS
11
Share Link: 