Renesas Hitachi H8S/2191, Hardware Manual

Page: 306 / 1065

Rev. 2.0, 11/00, page 279 of 1037
(1) Operation of the Realtime Output Port (PMR6 = 1)
When PMR6 is 1, it operates as a realtime output port. When a trigger is input, PMR6
transfers the PDR6 data to PDRS6 and the PCR6 data to PCRS6, respectively. In this case,
when PCRS6 is 1, the PDRS6 data of the corresponding bit is output to the RP pin. When
PCRS6 is 0, the RP pin of the corresponding bit is output to the high-impedance state. In
other words, the pin output state (High or Low) or high-impedance state can instantaneously
be switched by a trigger input.
Adversely, when PDR6 is read, the PDR6 values are read regardless of the PCR6 and PCRS6
values.
(2) Operation of the general I/O port (PMR6 = 0)
When PMR6 is 0, it operates as a general I/O port. When data is written to PDR6, the same
data is also written to PDRS6. Accordingly, because both PDR6 and PDRS6 and both PCR6
and PCRS6 can be handled as one register, respectively, they can be used in the same way as
a normal general I/O port. In other words, if PCR6 is 1, the PDR6 data of the corresponding
bit is output to the P6 pin. If PCR6 is 0, the P6 pin of the corresponding bit becomes an
input.
Adversely, assuming that PDR6 is read, the PDR6 values are read when PCR6 is 1 and the
pin values are read when PCR6 is 0.
11.8.5 Pin States
Table 11.22 shows the port 6 pin states in each operation mode.
Table 11.22 Port 6 Pin States
Pins Reset Active Sleep Standby Watch Subactive Subsleep
P67/RP7 to
P60/RP0
High-
impedance
Operation Holding High-
impedance
High-
impedance
Operation Holding