Datasheet
Table Of Contents
- Notes regarding these materials
- General Precautions in the Handling of MPU/MCU Products
- How to Use This Manual
- Table of Contents
- Quick Reference by Address B-
- 1. Overview
- 2. Central Processing Unit (CPU)
- 2.1 Data Registers (R0, R1, R2 and R3)
- 2.2 Address Registers (A0 and A1)
- 2.3 Frame Base Register (FB)
- 2.4 Interrupt Table Register (INTB)
- 2.5 Program Counter (PC)
- 2.6 User Stack Pointer (USP) and Interrupt Stack Pointer (ISP)
- 2.7 Static Base Register (SB)
- 2.8 Flag Register (FLG)
- 2.8.1 Carry Flag (C Flag)
- 2.8.2 Debug Flag (D Flag)
- 2.8.3 Zero Flag (Z Flag)
- 2.8.4 Sign Flag (S Flag)
- 2.8.5 Register Bank Select Flag (B Flag)
- 2.8.6 Overflow Flag (O Flag)
- 2.8.7 Interrupt Enable Flag (I Flag)
- 2.8.8 Stack Pointer Select Flag (U Flag)
- 2.8.9 Processor Interrupt Priority Level (IPL)
- 2.8.10 Reserved Area
- 3. Memory
- 4. Special Function Registers (SFRs)
- 5. Reset
- 6. Processor Mode
- 7. Clock Generation Circuit
- 8. Protection
- 9. Interrupt
- 10. Watchdog Timer
- 11. DMAC
- 12. Timer
- 13. Serial I/O
- 14. A/D Converter
- 15. CRC Calculation Circuit
- 16. Programmable I/O Ports
- 16.1 Port Pi Direction Register (PDi Register, i = 1, 6 to 10)
- 16.2 Port Pi Register (Pi Register, i = 1, 6 to 10)
- 16.3 Pull-up Control Register 0 to Pull-up Control Register 2 (PUR0 to PUR2 Registers)
- 16.4 Port Control Register
- 16.5 Pin Assignment Control register (PACR)
- 16.6 Digital Debounce function
- 17. Flash Memory Version
- 17.1 Flash Memory Performance
- 17.2 Memory Map
- 17.3 Functions To Prevent Flash Memory from Rewriting
- 17.4 CPU Rewrite Mode
- 17.5 Register Description
- 17.6 Precautions in CPU Rewrite Mode
- 17.6.1 Operation Speed
- 17.6.2 Prohibited Instructions
- 17.6.3 Interrupts
- 17.6.4 How to Access
- 17.6.5 Writing in the User ROM Space
- 17.6.6 DMA Transfer
- 17.6.7 Writing Command and Data
- 17.6.8 Wait Mode
- 17.6.9 Stop Mode
- 17.6.10 Low Power Consumption Mode and On-chip Oscillator-Low Power Consumption Mode
- 17.7 Software Commands
- 17.8 Status Register
- 17.9 Standard Serial I/O Mode
- 17.10 Parallel I/O Mode
- 18. Electrical Characteristics
- 19. Usage Notes
- 19.1 SFR
- 19.2 PLL Frequency Synthesizer
- 19.3 Power Control
- 19.4 Protect
- 19.5 Interrupts
- 19.6 DMAC
- 19.7 Timer
- 19.8 Serial I/O
- 19.9 A/D Converter
- 19.10 Programmable I/O Ports
- 19.11 Electric Characteristic Differences Between Mask ROM
- 19.12 Mask ROM Version
- 19.13 Flash Memory Version
- 19.13.1 Functions to Inhibit Rewriting Flash Memory
- 19.13.2 Stop mode
- 19.13.3 Wait mode
- 19.13.4 Low power dissipation mode, on-chip oscillator low power dissipation mode
- 19.13.5 Writing command and data
- 19.13.6 Program Command
- 19.13.7 Operation speed
- 19.13.8 Instructions prohibited in EW0 Mode
- 19.13.9 Interrupts
- 19.13.10 How to access
- 19.13.11 Writing in the user ROM area
- 19.13.12 DMA transfer
- 19.13.13 Regarding Programming/Erasure Times and Execution Time
- 19.13.14 Definition of Programming/Erasure Times
- 19.13.15 Flash Memory Version Electrical Characteristics 10,000 E/W cycle product
- 19.13.16 Boot Mode
- 19.14 Noise
- 19.15 Instruction for a Device Use
- Appendix 1. Package Dimensions
- Appendix 2. Functional Difference
- Register Index
- REVISION HISTORY
13. Serial I/O
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Table 13.1.3.2.1. STSPSEL Bit Functions
Figure 13.1.3.2.1. STSPSEL Bit Functions
Function
Output of SCL2 and SDA2 pins
Start/stop condition interrupt
request generation timing
STSPSEL = 0
Output transfer clock and data/
Program with a port determines
how the start condition or stop
condition is output
Start/stop condition are de-
tected
STSPSEL = 1
The STAREQ, RSTAREQ and
STPREQ bit determine how the
start condition or stop condition is
output
Start/stop condition generation are
completed
SDA2
Start condition detection
interrupt
Stop condition detection
interrupt
(1) In slave mode,
CKDIR is set to "1" (external clock)
SCL2
SDA2
Start condition detection
interrupt
Stop condition detection
interrupt
(2) In master mode,
CKDIR is set to "0" (internal clock), CKPH is set to "1"(clock delayed)
SCL2
Set STPREQ
to "1" (start)
STPSEL bit
0
STPSEL bit
Set to "1" by
a program
Set to "0" by
a program
Set to "1" by
a program
Set to "0" by
a program
1st 2nd 3rd 5th 6th 7th 8th 9th bit
4th
Set STAREQ to "1" (start)
1st 2nd 3rd 5th 6th 7th 8th 9th bit
4th
13.1.3.3 Arbitration
Unmatching of the transmit data and SDA2 pin input data is checked synchronously with the rising
edge of SCL2. Use the ABC bit in the U2SMR register to select the timing at which the ABT bit in the
U2RB register is updated. If the ABC bit is set to "0" (updated bitwise), the ABT bit is set to “1” at the
same time unmatching is detected during check, and is cleared to “0” when not detected. In cases
when the ABC bit is set to “1”, if unmatching is detected even once during check, the ABT bit is set to
“1” (unmatching detected) at the falling edge of the clock pulse of 9th bit. If the ABT bit needs to be
updated bytewise, clear the ABT bit to “0” (undetected) after detecting acknowledge in the first byte,
before transferring the next byte.
Setting the ALS bit in the U2SMR2 register to “1” (SDA output stop enabled) causes arbitration-lost to
occur, in which case the SDA2 pin is placed in the high-impedance state at the same time the ABT bit
is set to “1” (unmatching detected).