4571 Datasheet, PDF (51/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
QzROM Writing Mode
In the QzROM writing mode, the user ROM area can be
rewritten while the microcomputer is mounted on-board by using
a serial pro-grammer which is applicable for this microcomputer.
Table 24 lists the pin description (QzROM writing mode) and
Figure 53 shows the pin connections.
Refer to Figure 54 for examples of a connection with a serial pro-
grammer.
Contact the manufacturer of your serial programmer for serial
pro-grammer. Refer to the user’s manual of your serial
programmer for details on how to use it.
Table 24 Pin description (QzROM writing mode)
Pin
VDD
VSS
K
P01
P00
P10
RESET
Name
Power source
GND
VPP input
SDA input/output
SCLK input
PGM input
Reset input
I/O
−
−
−
I/O
Input
Input
Input
XIN
Clock input
−
XOUT
Clock output
−
P02, P03, P11−P13,
I/O port
I/O
P20/INT0, P21/INT1, P30,
P31, D0−D3, D4/CNTR0,
C/CNTR1
Function
• Power supply voltage pin.
• GND pin.
• QzROM programmable power source pin.
• QzROM serial data I/O pin.
• QzROM serial clock input pin.
• QzROM read/program pulse input pin.
• Reset input pin.
• Input “L” level signal.
• Either connect an oscillation circuit or connect XIN pin to VSS and leave
the XOUT pin open.
• Input “H” or “L” level signal or leave the pin open.
Rev.1.02 May 25, 2007 Page 51 of 124
REJ03B0179-0102