Renesas Hitachi H8S/2191, Hardware Manual, Page: 281 / 1065

Rev. 2.0, 11/00, page 254 of 1037
11.5 Port 3
11.5.1 Overview
Port 3 is an 8-bit I/O port. Table 11.11 shows the port 3 configuration.
Port 3 consists of pins that are used both as standard I/O ports (P37 to P30) and timer J timer
output (TMO), buzzer output (BUZZ), 8-bit PWN outputs (PWN3 to PWN0), SCI2 strobe output
(STRB), or chip select input (
&6). It is switched by port mode register 3 (PMR3) and port
control register 3 (PCR3).
Port 3 can select the MOS pull-up function.
Table 11.11 Port 3 Configuration
Port Function Alternative Function
P37 (standard I/O port) TMO (timer J timer output)
P36 (standard I/O port) BUZZ (timer J buzzer output)
P35 (standard I/O port) PWM3 (8-bit PWM output)
P34 (standard I/O port) PWM2 (8-bit PWM output)
P33 (standard I/O port) PWM1 (8-bit PWM output)
P32 (standard I/O port) PWM0 (8-bit PWM output)
P31 (standard I/O port) STRB (SCI2 strobe output)
Port 3
P30 (standard I/O port)
&6
(SCI2 chip select input)
11.5.2 Register Configuration
Table 11.12 shows the port 3 register configuration.
Table 11.12 Port 3 Register Configuration
Name Abbrev. R/W Size Initial Value Address *
Port mode register 3 PMR3 R/W Byte H'00 H'FFD0
Port control register 3 PCR3 W Byte H'00 H'FFD3
Port data register 3 PDR3 R/W Byte H'00 H'FFC3
MOS pull-up select
register 3 PUR3 R/W Byte H'00 H'FFE3
Note: * Lower 16 bits of the address.