UPD17073 NEC, UPD17073 Datasheet - Page 35

• Manufacturer Part Number: UPD17073
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
• Manufacturer: NEC

5.3 Bank Register (BANK)
5.3.1 Configuration of bank register
however, that the higher 3 bits are always fixed to “0”; therefore, this register actually serves as a 1-bit register.
5.3.2 Function of bank register
specified bank.
Figure 5-3 shows the configuration of the bank register.
As shown in this figure, the bank register consists of 4 bits of address 79H (BANK) of the system register. Note,
The bank register selects a bank of the data memory.
Table 5-1 shows the value of the bank register and how a bank of the data memory is specified.
Since the bank register exists on the system register, its contents can be rewritten regardless of the currently
In other words, the current bank status has nothing to do with manipulation of the bank register.
Table 5-1. Specifying Bank of Data Memory
Figure 5-3. Bank Register Configuration
Power-ON
Clock stop
CE
b
0
0
Address
3
Symbol
Name
Data
Bit
Bank register
b
(BANK)
0
0
2
b
0
0
1
b
0
1
b
0
0
3
Bank of data
Bank register
b
0
memory
(BANK)
BANK0
BANK1
2
BANK
79H
0
0
0
0
b
1
b
0
PD17072,17073
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