NEC uPD78056Y - Manual (Page 548)

548
CHAPTER 26
µ
PD78P054, 78P058
Notes 1. The internal ROM and internal high-speed RAM capacities are set as follows by RESET input:
Internal PROM: 32K bytes (
µ
PD78P054), 60K bytes (
µ
PD78P058)
Internal high-speed RAM: 1024 bytes
2. The internal expansion RAM is set to 1024 bytes by RESET input.
Caution The noise immunity and noise radiation differ between PROM versions and mask ROM versions.
When considering replacement of PROM versions with mask ROM versions in the stage between
test production and mass production, evaluate thoroughly with CS products (not ES products)
of the mask ROM versions.
Remarks 1. The
µ
PD78P054 is a PROM model corresponding to the
µ
PD78052, 78053, and 78054.
The
µ
PD78P058 is a PROM model corresponding to the
µ
PD78055, 78056, and 78058.
2. Only the
µ
PD78058 and 78P058 are provided with an internal expansion RAM size switching
register.
Table 26-2. Differences between
µ
PD78P054 and 78P058
Item
µ
PD78P054
µ
PD78P058
Internal PROM 32 Kbytes 60 Kbytes
Internal expansion RAM Not provided 1024 bytes
Internal expansion RAM Not provided Provided
size switching register