HD404019R Datasheet, PDF (9/65 Pages) Renesas Technology Corp – CMOS 4-bit single-chip microcomputers

Memory Map
HD404019R Series
ROM Memory Map
The MCU contains a 16,384-word × 10-bit ROM (mask ROM or PROM). It is described in the following
paragraphs and by the ROM memory map in figure 1.
Vector Address Area ($0000 to $000F): Locations $0000 through $000F are reserved for JMPL
instructions to branch to the starting address of the initialization program and of the interrupt programs.
After reset or an interrupt routine is processed, the program is executed from the vector address.
Zero-Page Subroutine Area ($0000 to $003F): Locations $0000 through $003F are reserved for
subroutines. The CAL instruction branches to subroutines.
Pattern Area ($0000 to $0FFF): Locations $0000 through $0FFF are reserved for ROM data. The P
instruction can refer to the ROM data as a pattern.
Program Area ($0000 to $3FFF): Locations from $0000 to $3FFF can be used for program code.
0
15
16
63
64
4095
4096
Vector address
$0000
$000F
$0010
Zero-page subroutine
(64 words)
$003F
$0040
Pattern
(4096 words)
$0FFF
$1000
Program
(16,384 words)
0
JMPL instruction
$0000
1 (jump to reset 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 routine) $0009
10
$000A
11
$000B
12
JMPL instruction
$000C
13 (jump to serial routine) $000D
14
$000E
15
$000F
16383
$3FFF
Figure 1 ROM Memory Map
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