Activating The Serial Prom Mode - Philips CEM2100/00 Service Manual

20. Serial PROM Mode
20.3 Serial PROM Mode Setting

20.3.4 Activating the Serial PROM Mode

The following is a procedure to activate the serial PROM mode. " Figure 20-4 Serial PROM Mode Timing "
shows a serial PROM mode timing.
VDD
TEST(Input)
RESET(Input)
PROGRAM
BOOT/RXD1 (Input)
1. Supply power to the VDD pin.
2. Set the pin to low.
RESET
3. Set the TEST pin and BOOT/RXD1 pins to high.
4. Wait until the power supply and clock oscillation stabilize.
5. Set the pin to high.
RESET
6. Input the matching data (5AH) to the BOOT/RXD1 pin after setup sequence. For details of the setup
timing, refer to " 20.15 UART Timing ".
don't care
High level setting
Figure 20-4 Serial PROM Mode Timing
Reset mode
Setup time for serial PROM mode (Rxsup)
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T5CL8
Serial PROM mode
Matching data
input