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5.4 Block Diagram
80188-40
watchdog timer
16 bits timer
hardware serial no.
RTC &
NVSRAM
SRAM:
512K for 7188EX(D)
256K
for
7188EX(D)-256
Flash-ROM: 512K for 7188EX(D)
256K
for
7188EX(D)-256
7188EX
7188EXD
7188EX-256
7188EXD-256
COM2
RS-485
I/O Expansion
Bus
E1
10BaseT
COM1
RS-232
EEPROM
(2K)
5-digit LED
(7188EXD)
(7188EXD-256)
+10V to +30V
power converter
+5V
7188E Series Hardware User’s Manual, 2004, v2.2, 7MH-016-22 ----- 78