UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 143

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

(3) When specified as control signal input/output
P10 and P11 (by setting (1) the ENn bit (n = 0 or 1) of the PWM control register(PWMC)) and P12 to P14 (by setting (1)
bits of the port 1 mode control register (PMC1)) can be used as control signal inputs or outputs bit-wise irrespective of the
setting of the port 1 mode register (PM1). When a pin is used as a control signal, the control signal status can be seen by
executing a port read instruction.
(a) When port is control signal output
(b) When port is control signal input
When the port 1 mode register (PM1) is set (1), the control signal pin level can be read by executing a port read
instruction.
When PM1 is reset (0), the PD784026 internal control signal status can be read by executing a port read instruction.
When the port 1 mode register (PM1) is set (1), control signal pin level can be read by executing a port read instruction.
Control
(Output)
Internal
Bus
RD
Figure 5-18 Control Specification
CHAPTER 5 PORT FUNCTIONS
PM1n = 0
Control (Input)
PM1n = 1
P1n
n = 0-4
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