UPD78F0537DGA(T)-9EV-A NEC, UPD78F0537DGA(T)-9EV-A Datasheet - Page 430

• 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

430
(4) IIC clock selection register 0 (IICCL0)
Address: FFA8H
Condition for clearing (CLD0 = 0)
• When the SCL0 pin is at low level
• When IICE0 = 0 (operation stop)
• Reset
Condition for clearing (DAD0 = 0)
• When the SDA0 pin is at low level
• When IICE0 = 0 (operation stop)
• Reset
Digital filter can be used only in high-speed mode.
In high-speed mode, the transfer clock does not vary regardless of DFC0 bit set (1)/clear (0).
The digital filter is used for noise elimination in high-speed mode.
Symbol
IICCL0
This register is used to set the transfer clock for the I
IICCL0 is set by a 1-bit or 8-bit memory manipulation instruction. However, the CLD0 and DAD0 bits are read-
only. The SMC0, CL01, and CL00 bits are set in combination with bit 0 (CLX0) of IIC function expansion
register 0 (IICX0) (see 17.3 (6) I
Set IICCL0 while bit 7 (IICE0) of IIC control register 0 (IICC0) is 0.
Reset signal generation sets IICCL0 to 00H.
Note Bits 4 and 5 are read-only.
Remark
SMC0
DAD0
DFC0
CLD0
0
1
0
1
0
1
0
1
The SCL0 pin was detected at low level.
The SCL0 pin was detected at high level.
The SDA0 pin was detected at low level.
The SDA0 pin was detected at high level.
Operates in standard mode.
Operates in high-speed mode.
Digital filter off.
Digital filter on.
IICE0: Bit 7 of IIC control register 0 (IICC0)
7
0
After reset: 00H
Figure 17-8. Format of IIC Clock Selection Register 0 (IICCL0)
6
0
CHAPTER 17 SERIAL INTERFACE IIC0
2
C transfer clock setting method).
Detection of SDA0 pin level (valid only when IICE0 = 1)
Detection of SCL0 pin level (valid only when IICE0 = 1)
CLD0
<5>
R/W
User’s Manual U17260EJ6V0UD
Note
DAD0
Digital filter operation control
<4>
Operation mode switching
2
C bus.
Condition for setting (CLD0 = 1)
• When the SCL0 pin is at high level
Condition for setting (DAD0 = 1)
• When the SDA0 pin is at high level
SMC0
<3>
DFC0
<2>
CL01
1
CL00
0