UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 30

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

3.1.1 Internal program memory space
program counter (PC).
Caution No interrupt sources correspond to the vector table address 0014H.
3.1.2 Internal data memory space
30
0000H
0006H
0008H
000AH
000CH
000EH
0010H
The internal program memory space stores programs and table data. This space is usually addressed by the
The 78K0S/KA1+ provides the following internal ROMs (or flash memory) containing the following capacities.
The following areas are allocated to the internal program memory space.
(1)
(2)
(3)
(4)
128-byte internal high-speed RAM is provided in the PD78F9221 and 256-byte in the PD78F9222.
The internal high-speed RAM can also be used as a stack memory.
Vector Table Address
Vector table area
The 34-byte area of addresses 0000H to 0021H is reserved as a vector table area. This area stores program
start addresses to be used when branching by Reset or interrupt request generation.
16-bit address, the lower 8 bits are stored in an even address, and the higher 8 bits are stored in an odd
address.
CALLT instruction table area
The subroutine entry address of a 1-byte call instruction (CALLT) can be stored in the 64-byte area of
addresses 0040H to 007FH.
Option byte area
The option byte area is the 1-byte area of address 0080H. For details, refer to CHAPTER 17 OPTION
BYTE.
Protect byte area
The protect byte area is the 1-byte area of address 0081H. For details, refer to CHAPTER 18 FLASH
MEMORY.
PD78F9221
PD78F9222
Part Number
Reset
INTLVI
INTP0
INP1
INTTMH1
INTTM000
INTTM010
Interrupt Request
Table 3-1. Internal ROM Capacity
CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16898EJ5V0UD
Table 3-2. Vector Table
Flash memory
Structure
0012H
0016H
0018H
001AH
001CH
001EH
0020H
Vector Table Address
Internal ROM
2,048
4,096
8 bits
8 bits
Capacity
INTAD
INTP2
INTP3
INTTM80
INTSRE6
INTSR6
INTST6
Interrupt Request
Of a