CHAPTER 2 PIN FUNCTIONS
User’s Manual U12688EJ4V0UM00
50
(2) P10 to P17 (Port 1) ··· 3-state I/O
Port 1 is an 8-bit input/output port that can be set to input or output in 1-bit units.
Besides functioning as a port, in the control mode it operates as the input/output for the real-time pulse unit
(RPU), the external interrupt request input and the DMA request input.
The operation mode can be set as port or control in 1-bit units, specified by the port 1 mode control register
(PMC1).
(a) Port mode
P10 to P17 can be set to input or output in bit units by the port 1 mode register (PM1).
(b) Control Mode
P10 to P17 can be set in the port/control mode in bit units by the PMC1 register.
(i)
TO110, TO111 (Timer Output) ··· output
Output the pulse signals for timer 1.
(ii) TCLR11 (Timer Clear) ··· input
This is an input pin for external clear signals for timer 1.
(iii) TI11 (Timer Input) ··· input
This is an input pin for an external counter clock for timer 1.
(iv) INTP110 to INTP113 (Interrupt Request from Peripherals) ··· input
These are input pins for external interrupt requests for timer 1.
(v) DMAAK0 to DMAAK3 (DMA Acknowledge) ··· output
This signal shows that a DMA service request was acknowledged.
They correspond to DMA channels 0 to 3, respectively, and operate independently of each other.
These signals become active only when external memory is being accessed. When DMA transfers
are being executed between internal RAM and internal peripheral I/O, they do not become active.
These signals are activated on the falling of the CLKOUT signal in the T0, T1R, or T1FH state of the
DMA cycle, and are retained at the active level during DMA transfers.
Содержание V850E/MS1 UPD703100
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