參數資料
型號: μPD789197
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數: 23/146頁
文件大?。?/td> 630K
代理商: ΜPD789197
Preliminary Product Information
23
μ
PD789186, 789187, 789196, 789197
5. EEPROM
5.1
EEPROM Functions
The
μ
PD789186,
μ
PD789187,
μ
PD789196, and
μ
PD789197 have a built-in EEPROM (electrically erasable
PROM) (128
×
8 bits) as well as a built-in high-speed RAM as data memory.
Unlike ordinary RAM, the EEPROM can hold its data even when the power is turned off. Moreover, the EEPROM
can erase its electrical data without using ultraviolet rays unlike EPROM.
For EEPROM manipulation, an 8-bit memory manipulation instruction is used.
5.2
EEPROM Configuration
The EEPROM consists of an EEPROM body and control section.
The control section consists of EEPROM write control register 0 (EEWC0) for exercising EEPROM write control,
and a section that generates an interrupt request signal (INTEE0) upon detection of termination of write operation.
Figure 5-1. Block Diagram of EEPROM
Internal bus
Data latch
EWCS02EWCS01EWCS00
ERST0 ERE0 EWST0 EWE0
EEPROM
(128
×
8 bits)
EEPROM timer
Prescaler
Read/write
control circuit
A
EEPROM write control register 0
(EEWC0)
f
X
/2
3
-f
X
/2
8
INTEE0
8-bit timer (TM80)
output
5.3
EEPROM Control Register
The EEPROM is controlled using EEPROM write control register 0 (EEWC0).
EEWC0 is the register set for selecting an EEPROM count clock and controlling writes to the EEPROM.
EEWC0 is set using a 1-bit or 8-bit memory manipulation instruction.
A RESET input loads 04H into EEWC0.
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