MITSUBISHI MICROCOMPUTERS
4280 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTERS
VPP pin.
(1) PROM mode (serial input/output)
In the PROM mode, three types of software commands (read,
program, and program verify) can be used. Clock-synchronous
serial I/O is used, beginning from the LSB (LSB first).
Refer to the Mitsubishi Data Book “DEVELOPMENT
SUPPORT TOOLS FOR MICROCOMPUTERS” about the
serial programmer for the Mitsubishi single-chip
microcomputers.
The M34280E1FP/GP has a PROM mode in addition to a
normal operation mode. It has a function to serially input/output
the command codes, addresses, and data required for
operation (e.g., read and program) on the built-in PROM using
only a few pins. This mode can be selected by setting pins
SDA (serial data input/output), SCLK (serial clock input), PGM
and VPP to “H” after connecting wires as shown in Figure 1
and powering on the VDD pin, and then applying 12.5V to the
PIN CONFIGURATION (TOP VIEW)
Vss
VSS
VDD
1
2
20
19
18
17
16
15
14
13
12
11
VDD
Vpp
E2
CARR
D0
3
E1
XIN
4
D1
D2
D3
D4
D5
D6
D7
5
XOUT
SCLK
6
E0
G0
G1
G2
G3
SDA
7
PGM
8
9
10
Outline 20P2N-A
20P2E/F-A
: connected to the ceramic resonance circuit
Note: The state of disconnected pins are the same as that at reset.
Fig. 27 Pin configuration of built-in PROM version (continued)
MITSUBISHI
ELECTRIC
40
MITSUBISHI [ Mitsubishi Group ]
