Renesas M16C Series User Manual page 366

M30240 Group
5.1 Built-in PROM Version
The built-in PROM (programmable ROM) version has the same function as the mask ROM version. It is
possible to program the built-in PROM with a general purpose PROM programmer by using a
programming adapter that is suitable for the microcomputer.
Built-in PROM version is available in two types:
• One-time PROM version (OTP)
Possible to program in PROM once
Suitable for small quantities and various production.
• EPROM version
Possible to program in PROM repeatedly because a program can be erased by exposing the erase
window on the top of the package to an ultraviolet light source.
5.2 EPROM version
The EPROM version has the following two modes:
• Normal operating mode
Same functions as the mask ROM version
• EPROM mode
Programs to the built-in PROM. The built-in ROM version enters this mode when "L" level is input to
the RESET pin and P6
5.2.1 EPROM mode pins
5.2.1.1 Pin Functions
Table 5.1 lists the pin functions in the EPROM mode. In normal operating mode, each pin has the
same function as the mask ROM version.
Table 5.1: Pin functions in EPROM mode
Pin
Vcc, Vss Power source
CNVss Vpp Input
RESET Reset input
X
Clock input
IN
X
Clock output
OUT
BYTE ---
AVcc
Analog power source input
AVss
Vref Reference voltage input
P0 to P0
Data input/output (D0 to D7)
0 7
P1 to P1
Address input (A8 to A15)
0 7
P2 to P2
Address input (A0 to A7)
0 7
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pin.
2
Input/
Name
Output
---
Input
Input
Input
Output
Input
---
Input
I/O
I/O
I/O
Functions
Apply 5V +/- 10% to the Vcc pin and 0V to the Vss pin
Apply Vpp when programming or verifying
Connect to Vss pin.
Connect X pin and X pin via a ceramic resonator or
IN OUT
quarts-crystal oscillator. When an externally generated
clock is used, input the clock to the X
X pin open.
OUT
Connect to Vcc pin.
Connect to Vcc pin.
Connect to Vss pin.
Connect to Vcc pin.
8-bit data (D0 to D7) input/output pin
The middle order 8-bit (A8 to A15) address input pins.
The low-order 8-bit (A0 to A7) address input pins.
Built-in PROM Version
pin and leave the
IN