c8051t602 Silicon Laboratories, c8051t602 Datasheet - Page 166
c8051t602
Manufacturer Part Number
c8051t602
Description
Mixed Signal Otp Eprom Mcu Family
Manufacturer
Silicon Laboratories
Datasheet
1.C8051T602.pdf
(168 pages)
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C8051T600/1/2/3/4/5
19.2. C2 Pin Sharing
The C2 protocol allows the C2 pins to be shared with user functions so that in-system debugging and
EPROM programming functions may be performed. This is possible because C2 communication is typi-
cally performed when the device is in the halt state, where all on-chip peripherals and user software are
stalled. In this halted state, the C2 interface can safely ‘borrow’ the C2CK (normally RST) and C2D (nor-
mally P0.7) pins. In most applications, external resistors are required to isolate C2 interface traffic from the
user application when performing debug functions. These external resistors are not necessary for produc-
tion boards. A typical isolation configuration is shown in Figure 19.1.
The configuration in Figure 19.1 assumes the following:
Additional resistors may be necessary depending on the specific application.
166
1. The user input (b) cannot change state while the target device is halted.
2. The RST pin on the target device is used as an input only.
/Reset (a)
Output (c)
Input (b)
Figure 19.1. Typical C2 Pin Sharing
C2 Interface Master
Rev. 0.5
C2CK (/RST)
C2D (P0.7)
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