4554 Datasheet, PDF (134/138 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4554 Group
BUILT-IN PROM VERSION
In addition to the mask ROM versions, the 4554 Group has the
One Time PROM versions whose PROMs can only be written to
and not be erased.
The built-in PROM version has functions similar to those of the
mask ROM versions, but it has PROM mode that enables writing to
built-in PROM.
Table 25 shows the product of built-in PROM version. Figure 61
shows the pin configurations of built-in PROM versions.
The One Time PROM version has pin-compatibility with the mask
ROM version.
Table 25 Product of built-in PROM version
Part number
PROM size
(✕ 10 bits)
M34554EDFP
16384 words
RAM size
(✕ 4 bits)
512 words
Package
64P6N-A
ROM type
One Time PROM [shipped in blank]
PIN CONFIGURATION (TOP VIEW)
SEG0/VLC3
SEG1/VLC2
SEG2/VLC1
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
49
32
50
31
51
30
52
29
53
28
54
27
55
26
56
M34554EDFP
25
57
24
58
23
59
22
60
21
61
20
62
19
63
18
64
17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
D4
D5
D6
CNVSS
VDCE
XCIN
XCOUT
VDD
VSS
XOUT
XIN
RESET
D7/CNTR0
C/CNTR1
D8/INT0
D9/INT1
Fig. 61 Pin configuration of built-in PROM version
Rev.3.00 Aug 06, 2004 page 134 of 136
REJ03B0043-0300Z