w925e625 ETC-unknow, w925e625 Datasheet - Page 8

• Manufacturer Part Number: w925e625
• Description: 8-bit Cid Microcontroller
• Manufacturer: ETC-unknow

W925E/C625
6. FUNCTIONAL DESCRIPTION
The W925E/C625 is an 8-bit micro-controller with CID function. The 8-bit micro-control has the same
instruction set as the 8051 family, with one addition: DEC DPTR (op-code A5H, the DPTR is
decreased by 1). In addition, the W925E/C625 contains on-chip 4K + 224 bytes MOVX RAM.
ROM:
There are 64K bytes EEPROM/MASK ROM. The total 64K bytes EEPROM/MASK ROM is used for
program code. The completely 64K bytes EEPROM/MASK ROM can be used for the look-up table
memory.
On-chip Data RAM:
The W925E/C625 has 4K normal RAM + 224 Bytes of discontinuity LCD RAM which address is from
0000H to 0FFFH + 2000H to 20FEH. It only can be accessed by MOVX instruction; this on-chip RAM
is optional under software control. The 224 bytes of RAM, which no appends to the 4K bytes RAM, are
used for LCD RAM. The on-chip data RAM is not used for executable program memory. There is no
conflict or overlap among the 256 bytes scratchpad RAM and the 4K Bytes MOVX RAM as they use
different addressing modes and separate instructions.
CID:
The CID functions include the FSK decoder, CAS detector, and DTMF decoder and ring detector.
FSK modulator:
Support ITU-T V.23 and Bellcore 202 FSK transmit modulate signal
DTMF modulator:
The W925E/C625 built-in Dual tone multi-frequency generator.
I/O Ports:
The W925E/C625 has five 8-bit I/O ports giving 40 lines. Port0 to Port3 can be used as an 8-bit
general I/O port with bit-addressable. The I/O mode of each port are controlled by PxIO registers. Port
1 to Port 4 have internal pull high resistors enabled/disabled by PxH registers. Port0 is open-drain type
in output mode.
Serial I/O port:
The serial port, through P4.0 (SCLK) and P4.1 (SDATA), is an 8-bit synchronous serial I/O interface.
Timers:
The W925E/C625 has two 13/16-bit timers or 8 bits auto-reload timers. An independent watchdog
timer is used as a System Monitor or as a very long time period timer. A divider can produce the
divider interrupt in every period of 0.5S or 0.25S.
Comparator:
The W925E/C625 has an internal comparator with one external analog signal input path VNEG and an
external path VPOS or a regulator voltage for the reference input REF1.
LCD:
The LCD display of 1792 dots is 1/5 bias with 56 segments and 32 commons. The LCD display of The
LCD voltage is from internal regulator or external voltage source.
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