ml7214a-001 Oki Semiconductor, ml7214a-001 Datasheet - Page 23

• Manufacturer Part Number: ml7214a-001
• Description: Voip Codec
• Manufacturer: Oki Semiconductor

INTB/GPIOA[6]
Primary function: INTB
Secondary function: GPIOA[6]
A0-A7
These are address input pins for accessing a frame/DMA/control register. Each address is as follows.
Transmit buffer (TX Buffer)
Receive buffer (RX Buffer)
Control register (CR)
D0-D15
These are data I/O pins for accessing a frame/DMA/control register. Since these pins are I/O pins, connect
pull-up resistors. When an 8-bit bus access is selected in the MCU interface data width selection register
(BW_SEL), pins D0-D7 are enabled. When using the pins with 8-bit bus access (BW_SEL = “1”), fix the input
of high-order D8-D15 to either “0” or “1” since they are constantly in an input state.
CSB
This is a chip select input pin for accessing a frame/control register.
RDB
This is a read enable input pin for accessing a frame/DMA/control register.
WRB
This is a write enable input pin for accessing a frame/DMA/control register.
OKI Semiconductor
This is an interrupt request output pin as an extended function, but it is not supported in this code. If this pin
is not used as the GPIOA[6] pin, which a secondary function is assigned to , leave it open.
(Caution) The INTB pin is assigned as an extended function; however, it is not supported in this code.
Note that although the INTB pin normally has “H” output, “L” may be output for about 15.6 µsec when
DSP_ERR occurs.
When the primary function/secondary function selection register (GPFA[6]) of GPIOA[6] is set to “1”, this
pin functions as a general-purpose I/O port GPIOA[6].
A7-A0 = 80h
A7-A0 = 81h
See “A list of control registers” in the “CONTROL REGISTERS” Section for the addresses.
FEDL7214_001DIGEST-P
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