UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 429

• Manufacturer Part Number: UPD78F0537DGA(T)-9EV-A
• Description: 8BIT MCU, 128K FLASH, 7KB RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F0537DGA(T)-9EV-A

• Controller Family/series: UPD78
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 8
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

Symbol
IICF0
Address: FFABH
Note Bits 6 and 7 are read-only.
Cautions 1. Write to STCEN only when the operation is stopped (IICE0 = 0).
Remark
Condition for clearing (IICRSV = 0)
• Cleared by instruction
• Reset
Condition for clearing (STCEN = 0)
• Detection of start condition
• Reset
Condition for clearing (STCF = 0)
• Cleared by STT0 = 1
• When IICE0 = 0 (operation stop)
• Reset
Condition for clearing (IICBSY = 0)
• Detection of stop condition
• When IICE0 = 0 (operation stop)
• Reset
IICBSY
IICRSV
STCEN
STCF
STCF
<7>
0
1
0
1
0
1
0
1
Generate start condition
Start condition generation unsuccessful: clear STT0 flag
Bus release status (communication initial status when STCEN = 1)
Bus communication status (communication initial status when STCEN = 0)
Enable communication reservation
Disable communication reservation
After operation is enabled (IICE0 = 1), enable generation of a start condition upon detection of
a stop condition.
After operation is enabled (IICE0 = 1), enable generation of a start condition without detecting
a stop condition.
2. As the bus release status (IICBSY = 0) is recognized regardless of the actual bus
3. Write to IICRSV only when the operation is stopped (IICE0 = 0).
STT0: Bit 1 of IIC control register 0 (IICC0)
IICE0: Bit 7 of IIC control register 0 (IICC0)
IICBSY
After reset: 00H
<6>
status when STCEN = 1, when generating the first start condition (STT0 = 1), it is
necessary to verify that no third party communications are in progress in order to
prevent such communications from being destroyed.
Figure 17-7. Format of IIC Flag Register 0 (IICF0)
5
0
CHAPTER 17 SERIAL INTERFACE IIC0
R/W
User’s Manual U17260EJ6V0UD
Communication reservation function disable bit
4
0
Note
3
0
Initial start enable trigger
I
2
STT0 clear flag
C bus status flag
Condition for setting (IICRSV = 1)
• Set by instruction
Condition for setting (STCF = 1)
• Generating start condition unsuccessful and STT0
Condition for setting (IICBSY = 1)
• Detection of start condition
• Setting of IICE0 when STCEN = 0
Condition for setting (STCEN = 1)
• Set by instruction
2
0
cleared to 0 when communication reservation is
disabled (IICRSV = 1).
STCEN
<1>
IICRSV
<0>
429