UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 82

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

4.3 Memory Bank Select Register (BANK)
82
Notes 1. SM+ for 78K0/Fx2, ID78K0-QB
For details, see the RA78K0 Ver. 3.80 Assembler Package Operation User’s Manual (U17199E).
The memory bank select register (BANK) is used to select a memory bank to be used.
BANK can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears BANK to 00H.
Caution Be sure to change the value of the BANK register in the common area (0000H to 7FFFH).
Memory Bank Number
Memory bank 0
Memory bank 1
Memory bank 2
Memory bank 3
Memory bank 4
Memory bank 5
Address: FFF3H After reset: 00H R/W
Symbol
2. Set the memory bank to be used by the memory bank select register (BANK) (see Figure 4-3).
BANK
If the value of the BANK register is changed in the bank area (8000H to BFFFH), an inadvertent
program loop occurs in the CPU. Therefore, never change the value of the BANK register in the
bank area.
CHAPTER 4 MEMORY BANK SELECT FUNCTION (
BANK2
7
0
0
0
0
0
1
1
08000H-0BFFFH
Figure 4-3. Format of Memory Bank Select Register (BANK)
Other than above
Table 4-1. Memory Bank Address Representation
BANK1
CPU Address
6
0
0
0
1
1
0
0
Note 2
BANK0
User’s Manual U17554EJ4V0UD
5
0
0
1
0
1
0
1
Common area (32 K) + memory bank 0 (16 K)
Common area (32 K) + memory bank 1 (16 K)
Common area (32 K) + memory bank 2 (16 K)
Common area (32 K) + memory bank 3 (16 K)
Setting prohibited
Setting prohibited
08000H-0BFFFH
0C000H-0FFFFH
10000H-13FFFH
14000H-17FFFH
18000H-1BFFFH
1C000H-1FFFFH
Flash Memory Real Address
4
0
μ
PD78F0889
3
0
PD78F0889, 78F0890 ONLY)
Bank setting
BANK2
2
Common area (32 K) +
memory bank 4 (16 K)
Common area (32 K) +
memory bank 5 (16 K)
08000H-0BFFFH
18000H-1BFFFH
28000H-2BFFFH
38000H-3BFFFH
48000H-4BFFFH
58000H-5BFFFH
Simulator and Debugger
Address Representation in
BANK1
μ
PD78F0890
1
BANK0
0
Note 1