ml7005mb Oki Semiconductor, ml7005mb Datasheet - Page 15

• Manufacturer Part Number: ml7005mb
• Description: Dtmf Transceiver Ml7005dtmf Transceiver
• Manufacturer: Oki Semiconductor

¡ Semiconductor
REGISTER DESCRIPTION
Register Interface Description
The ML7005 contains a 4-bit DTMF transmit data register (DTMFT), a 4-bit DTMF receive data
register (DTMFR), a 4-bit control register (CR), and a 4-bit status register (STR). The DTMFT and
CR registers are for Write-only and the DTMFR and STR registers are for Read-only.
When the PTYPE pin is "1", accessing the registers is possible in the Intel processor mode. When
the PTYPE pin is "0", accessing the registers is possible in the Motorola processor mode.
In the Intel processor mode (PTYPE="1"), when CS is "0", data can be written to the DTMFT and
CR registers by fetching data from D3 to D0 at the rising edge of the WR signal. When CS is "0",
the contents of DTMFR and STR can be transferred to D3 to D0 by setting READ to "0".
In the Motorola processor mode (PTYPE="0"), when CS and WR are "0", data can be written to
the DTMFT and CR registers by fetching D3 to D0 data and ALE at the falling edge of READ.
When CS is "0" and WR is "1", the contents of DTMFR and STR are transferred to D3 to D0 by
latching ALE at the rising edge of READ.
When the PD pin is set to "1" the DTMFT and CR registers are reset.
Note:
DTMFT
DTMFR
CR
STR
Register
name
Register name
The contents of the DTMFT and CR registers cannot be read.
(address) in Intel
processor mode
DTMFR
DTMFT
STR
D1
CR
0
0
1
1
Accessing
D0
0
1
0
1
CPGC
DTR3
DTT3
D3
SP
processor mode
Table 1 Outline of Registers
ALE
Accessing in
0
0
1
1
Table 2 Register Names
Motorola
WR
0
1
0
1
DTTIM
DTR2
FXDR
DTT2
D2
Writing to DTMFT
Reading from DTMFR
Writing to CR
Reading from STR
DOEN
CPDR
DTR1
DTT1
D1
Description
DTR0
DTT0
DETF
MFC
D0
ML7005
15/24