UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 200

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

6.3 REAL-TIME OUTPUT PORT ACCESSES
6-3.
one of the P0H or P0L.
160
8-bit port mode
8-bit real-time output
port mode
4-bit separate real-time
output port mode
P00 to P03: Ports
P04 to P07: Real-time
P00 to P03: Real-time
P04 to P07: Ports
Remark — : The output latch and port 0 buffer registers are not affected.
The port 0 buffer registers (P0H, P0L) are mapped onto mutually independent addresses in the SFR area as shown in Figure
When the 4-bit 2-channel real-time output function is specified, data can be set in the P0H, P0L independently of each other.
When the 8-bit 1-channel real-time output function is specified, data can be set in P0H and P0L by writing 8-bit data to either
Table 6-1 shows the operations when port 0, the P0H and P0L are manipulated.
output port mode
output port mode
Operating Mode
* The contents of P0H are read from the high-order 4 bits, and the contents of P0L from the low-order 4 bits.
Table 6-1 Operations When Port 0 and Port 0 Buffer Registers (P0H, P0L) are Manipulated
Register
P0
P0L
P0H
P0
P0L
P0H
P0
P0L
P0H
P0
P0L
P0H
P0
P0L
P0H
Figure 6-3 Port 0 Buffer Register (P0H, P0L) Configuration
CHAPTER 6 REAL-TIME OUTPUT FUNCTION
Output latch
Buffer register*
Buffer register*
Output latch
Buffer register
Buffer register
Output latch
Buffer register*
Buffer register*
Output latch
Buffer register*
Buffer register*
Output latch
Buffer register*
Buffer register*
High-Order 4 Bits
0FF0EH
0FF0FH
High-Order 4 Bits
Read Operation
P0H
Low-Order 4 Bits
Low-Order 4 Bits
P0L
Output latch
Buffer register
Buffer register
Buffer register
Buffer register
Buffer register
Output latch
Buffer register
High-Order 4 Bits
—
—
—
—
—
Write Operation
—
—
Buffer register
Buffer register
Output latch
Buffer register
Buffer register
Low-Order 4 Bits
—
—
—
—
—