UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 525

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

detected edge is sent to internal hardware. The relation between pins P20 to P26 and the use of the detected edge is shown
in Table 19-1.
function for pins P20, P25 and P26 also operates in STOP mode and IDLE mode).
19.1 EDGE DETECTION FUNCTION CONTROL REGISTERS
19.1.1 External Interrupt Mode Registers (INTM0, INTM1)
for pins P20 to P23, and the INTM1 specifies the valid edge for pins P24 to P26.
P20
P21
P22
P23
P24
P25
P26
Pin
P20 to P26 have an edge detection function that allows a rising edge/falling edge to be set programmably, and the
The edge detection function operates at all times except in STOP mode and IDLE mode (although the edge detection
For the P21/INTP0 pin, the noise elimination time when edge detection is performed can be selected by software.
The INTMn (n = 0, 1) specify the valid edge to be detected on pins P20 to P26. The INTM0 specifies the valid edge
The INTMn can be read or written to with an 8-bit manipulation instruction or bit manipulation instruction.
The format of INTM0 and INTM1 are shown in Figures 19-1 and 19-2 respectively.
RESET input clears these registers to 00H.
NMI, standby circuit control
INTP0, timer/counter 1 capture signal
INTP1, timer/counter 2 CR22 capture signal
INTP2, CI (timer/counter 2 count clock signal),
INTP3, timer/counter 0 capture signal
INTP4, standby circuit control
INTP5, A/D converter conversion start signal, standby circuit control
timer/counter 1 count clock signal
Real-time output port trigger signal
timer/counter 0 count clock signal
timer/counter 2 CR21 capture signal
Table 19-1 Pins P20 to P26 and Use of Detected Edge
CHAPTER 19 EDGE DETECTION FUNCTION
Use
INTM0
INTM1
Detected Edge Specification Register
485