Serial Prom Mode Setting; Serial Prom Mode Control Pins; Pin Function - Philips CEM2100/00 Service Manual

20. Serial PROM Mode

20.3 Serial PROM Mode Setting

20.3 Serial PROM Mode Setting

20.3.1 Serial PROM Mode Control Pins

To execute on-board programming, activate the serial PROM mode. Table 20-2 shows pin setting to activate
the serial PROM mode.
Note: The BOOT pin is shared with the UART communication pin (RXD1 pin) in the serial PROM mode. This pin is used as UART
communication pin after activating serial PROM mode

20.3.2 Pin Function

In the serial PROM mode, TXD1 (P02) and RXD1 (P01) are used as a serial interface pin.
Table 20-3 Pin Function in the Serial PROM Mode
Pin Name
(Serial PROM Mode)
TXD1
BOOT/RXD1
RESET
TEST
VDD, AVDD
VSS
VAREF
I/O ports except
P02, P01
XIN
XOUT
Note 1: During on-board programming with other parts mounted on a user board, be careful no to affect these communication
control pins.
Note 2: Operating range of high frequency in serial PROM mode is 2 MHz to 16 MHz.
Table 20-2 Serial PROM Mode Setting
Pin
TEST pin
BOOT/RXD1 pin
pin
RESET
Input/
Output
Output Serial data output
Input/Input Serial PROM mode control/Serial data input
Input Serial PROM mode control
Input Fixed to high
Power
4.5 to 5.5 V
supply
Power
0 V
supply
Power
Leave open or apply input reference voltage.
supply
I/O
These ports are in the high-impedance state in the serial PROM mode.
Input
Self-oscillate with an oscillator.
Output
Page 234
Setting
High
High
Function
(Note 1)
T5CL8
Pin Name
(MCU Mode)
P02
P01
RESET
TEST
(Note 2)