HD404449 Datasheet, PDF (6/123 Pages) Hitachi Semiconductor – HD404449 SERIES

HD404449 Series
Memory Map
ROM Memory Map
The ROM memory map is shown in figure 1 and described below.
0
15
16
63
64
4,095
4,096
8,191
8,192
16,383
Vector address
Zero-page subroutine
(64 words)
Pattern
(4,096 words)
HD404448
Program
(8,192 words)
$0000
$000F
$0010
$003F
$0040
$0FFF
$1000
$1FFF
$2000
HD404449, HD4074449
Program
(16,384 words)
$3FFF
0
JMPL instruction
$0000
1 (Jump to RESET, STOPC routine) $0001
2
JMPL instruction
$0002
3
(Jump to INT0 routine)
$0003
4
JMPL instruction
$0004
5
(Jump to INT₁ routine)
$0005
6
JMPL instruction
$0006
7
(Jump to timer A routine)
$0007
8
JMPL instruction
$0008
9 (Jump to timer B, INT2 routine) $0009
10
JMPL instruction
$000A
11 ^{(Jump to timer C, INT}3 ^routine) $000B
12
JMPL instruction
$000C
13 ^{(Jump to timer D, A/D routine)} $000D
14
JMPL instruction
$000E
15 (Jump to serial 1, serial 2 routine) $000F
Figure 1 ROM Memory Map
Vector Address Area ($0000–$000F): Reserved for JMPL instructions that branch to the start addresses
of the reset and interrupt routines. After MCU reset or an interrupt, program execution continues from the
vector address.
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–$1FFF (HD404448), $0000–$3FFF (HD404449, HD4074449)): Used for
program coding.
RAM Memory Map
The MCU contains a 1,152-digit × 4-bit RAM area consisting of a memory register area, a data area, and a
stack area. In addition, an interrupt control bits area, special register area, and register flag area are mapped
onto the same RAM memory space as a RAM-mapped register area outside the above areas. The RAM
memory map is shown in figure 2 and described as follows.
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