71M6403
Electronic Trip Unit
SEPTEMBER 2006
Test Ports
TMUXOUT Pin: One out of 16 digital or 4 analog signals can be selected to be output on the TMUXOUT pin. The function of the
multiplexer is controlled with the I/O RAM register TMUX (0x2000[3:0]), as shown in Table 57.
TMUX[3:0]
Mode
analog
analog
analog
analog
digital
digital
digital
digital
digital
digital
digital
digital
--
Function
DGND
IBIAS
Reserved for production test
VBIAS
RTM (Real time output from CE)
Reserved for production test
V2_OK (Comparator 2 Output)
INEUTRAL_OK (Comparator 3 Output)
RXD (from Optical interface)
MUX_SYNC
CK_10M
CK_MPU
reserved for production test
CK38
Reserved
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
digital
digital
digital
Reserved
Table 57: TMUX[3:0] Selections
Emulator Port: The emulator port, consisting of the pins E_RST, E_TCLK and E_RXTX provides control of the MPU through an
external in-circuit emulator. The E_TBUS[3:0] pins, together with the E_ISYNC/BRKRQ add trace capability to the emulator. The
emulator port is compatible with the ADM51 emulators manufactured by Signum Systems.
The signals of the emulator port have weak pull-ups. Adding 3kΩ pull-up resistors on the PCB is recommended.
Real-Time Monitor: The RTM output of the CE is available as one of the digital multiplexer options. RTM data is read from the
CE DRAM locations specified by I/O RAM registers RTM0, RTM1, RTM2, and RTM3 after the rise of MUX_SYNC. The RTM can
be enabled and disabled with I/O RAM register RTM_EN. The RTM output is clocked by CK/4. Each RTM word is clocked out in
35 cycles and contains a leading flag bit. Figure 9 in the System Timing Section illustrates the RTM output format. RTM is low
when not in use.
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