HD404339 Datasheet, PDF (9/78 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer with large-capacity memory

HD404339 Series
Memory Map
ROM Memory Map
Vector Address Area ($0000–$000F): Reserved for JMPL instructions that branch to the start addresses
of the reset and interrupt routines.
Zero-Page Subroutine Area ($0000–$003F): Reserved for subroutines. The program branches to a
subroutine in this area in response to the CAL instruction.
Pattern Area ($0000–$0FFF): Contains ROM data that can be referenced with the P instruction.
Program Area ($0000-$0FFF (HD404334), $0000-$17FF (HD404336), $0000–$1FFF (HD404338),
$0000–$2FFF (HD4043312), $0000–$3FFF (HD404339, HD4074339)): The entire ROM area can be
used for program coding.
Note:
$0000
$000F
$0010
$003F
$0040
$0FFF
$1000
$17FF
$1800
$1FFF
$2000
Vector address
(16 words)
Zero-page subroutine
(64 words)
Pattern (4,096 words)
HD404334
Program (4,096 words)
HD404336
Program
(6,144 words)
HD404338
Program
(8,192 words)
$0000
JMPL instruction
$0001 (jump to RESET, STOPC routine)
$0002
$0003
JMPL instruction
(jump to INT ₀ routine)
$0004
$0005
JMPL instruction
(jump to INT ₁ routine)
$0006
$0007
JMPL instruction
(jump to timer A routine)
$0008
$0009
JMPL instruction
(jump to timer B routine)
$000A
$000B
JMPL instruction
(jump to timer C routine)
$000C
JMPL instruction
$000D (jump to A/D converter routine)
$000E
$000F
JMPL instruction
(jump to serial routine)
$2FFF
$3000
HD4043312
Program
(12,288 words)
HD404339, HD4074339
Program
(16,384 words)
$3FFF
Since the ROM address areas between $0000–$0FFF overlap, the user can determine how these
areas are to be used.
Figure 1 ROM Memory Map
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