CHAPTER 2 PIN FUNCTIONS
User’s Manual U12688EJ4V0UM00
49
2.3
Description of Pin Functions
(1) P00 to P07 (Port 0) ··· 3-state I/O
Port 0 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 0 mode control register
(PMC0).
(a) Port mode
P00 to P07 can be set to input or output in bit units by the port 0 mode register (PM0).
(b) Control mode
P00 to P07 can be set in the port/control mode in bit units by the PMC0 register.
(i)
TO100, TO101 (Timer Output) ··· output
Output the pulse signals for timer 1.
(ii) TCLR10 (Timer Clear) ··· input
This is an input pin for external clear signals for timer 1.
(iii) TI10 (Timer Input) ··· input
This is an input pin for an external counter clock for timer 1.
(iv) INTP100 to INTP103 (Interrupt Request from Peripherals) ··· input
These are input pins for external interrupt requests for timer 1.
(v) DMARQ0 to DMARQ3 (DMA Request) ··· input
These are DMA service request signals. They correspond to DMA channels 0 to 3, respectively, and
operate independently of each other. The priority order is fixed at DMARQ0 > DMARQ1 > DMARQ2
> DMARQ3.
This signal is sampled when the CLKOUT signal falls. Maintain the active level until a DMA request
is received.
Содержание V850E/MS1 UPD703100
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