Toshiba DP120F, Service Manual

Page: 384 / 706

March 2000 © TOSHIBA TEC 7-75 DP120F/DP125F Circuit Description
• Sub-CPU Signal Table (1/2)
No. Signal Name Type Functions
1 XOUT O Sub-CPU drive clock output (4MHz)
2 XIN I Sub-CPU drive clock input (4MHz)
3 2WRESETX I Sub-CPU power-on reset signal (active-low)
Resets the Sub-CPU (IC37) when the power is turned
on.
4 WTOX O Gate control signal (active-low)
Controls the input gate for the line and document
detect signal.
5 LEDBLK I Power save LED blinking signal (active-low)
Requests the Sub-CPU to blink the power save LED.
6 R72 I 5VPS power up detect signal (active-high)
7 PWRSVKEY I Key input detect signal (active-low)
Detects key inputs.
8 DDET I Document detect signal (active-low)
Detects the presence or absence of a document.
9 PWRSVACK I Power save acknowledge signal (active-low)
Enables the Sub-CPU to transit to the power save
mode.
10 PWRSVNACK I Power save acknowledge signal (active-low)
Indicates restoration from the power save mode to
the Sub-CPU.
11 PWRSVLED O Power save LED lighting signal (L: ON)
Lights the power save LED installed on the Opera-
tion panel PBA.
12 R51 - Unused
13 PWRSVDI O Port enable signal (active-low)
Controls the signal input from the line and the input
of the document detect signal.
14 VSS - Signal ground
15 PWSV O Power save control signal (active-low)
Limits the power supply from LVPS in power save
mode.
16 HOOK1 I Hook detect signal (H: On-hook, L: Off-hook)
Detects the hook state of the handset (Option for
US/CA models only).
17 CISX I CI detect signal (H: Undetected, L: Detected)
Detects the ring signal sent from line 1 or 2.
I: Input O: Output I/O: Bidirectional