Wiring Between The S1C33Xxx Chip And Target Connector; Reset Request; Notes On Target System Power Supply - Epson S5U1C33001H1400 Manual

10.3.5

Wiring between the S1C33xxx chip and target connector

When wiring the S1C33xxx chip to the target connector for connecting the S5U1C33001H,
insert a 33 Ω resistor in series between the S1C33xxx chip DSIO pin and the connector.
This resistor must be placed as close to the S1C33xxx chip as possible. If the reset line is
not connected, the system can be operated without this 33 Ω resistor. However, we
recommend inserting this resistor to prevent malfunctions. The other pins are connected
directly. The total length of the line must be under 5 cm.
Forcible breaks are applied by inputting a low-level to the DSIO pin. Although this signal
is pulled up through an about 100 kΩ internally, when not debugging, we recommend
either removing the 33 Ω resistor to reduce noise and other problems or pulling this line up
to the VDD level (the core voltage).
10.3.6

Reset request

Do not reset the target system while the target program execution is suspended as the
S5U1C33001H will be unable to operate normally.
10.3.7

Notes on target system power supply

The allowable voltage range for the signals input from the target system is 0 to 3.6 V. The
S5U1C33001H may fail if voltages that exceed this range are input. Therefore, target
systems to be connected to the S5U1C33001H must be designed so that voltages outside
this range are not applied. Take special care in designing the target system power supply,
and design the target system so that overvoltages are not applied to the S5U1C33001H
when the target system power supply is turned on or off.
S1C33 Family In-Circuit Debugger
S5U1C33001H1400 Manual (Rev. 0.20)
Fig. 11 Wiring between S1C33xxx and target connector
EPSON
10. PRECAUTIONS
39