HD6473847RHV Datasheet, PDF (238/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 8 I/O Ports
8.7.2 Port Mode Register 9 (PMR9)
PMR9 controls the selection of the P90 and P91 pin functions.
Initial
Bit
Bit Name Value R/W Description
7 to 4 ⎯
All 1
⎯
Reserved
The initial value should not be changed.
3
PIOFF 0
R/W P92 to P90 Step-Up Circuit Control
This bit turns on and off the P92 to P90 step-up circuit.
0: Step-up circuit of large-current port is turned on
1: Step-up circuit of large-current port is turned off
Note: This bit is valid in the H8/3802 Group only. It
functions as a readable/writable reserved bit in
versions other than the H8/3802 Group.
2
⎯
⎯
W
Reserved
The write value should always be 0.
1
PWM2 0
R/W P9n/PWMn+1 Pin Function Switch
0
PWM1 0
R/W These bits select whether pin P9n/PWMn+1 is used as
P9n or as PWMn+1. (n = 1, 0)
0: P9n output pin
1: PWMn+1 output pin
Note:
When turning the step-up circuit on or off, the register must be rewritten only when the
buffer NMOS is off (port data is 1).
When turning the step-up circuit on, first clear PIOFF to 0, then wait for the elapse of 30
system clock before turning the buffer NMOS on (clearing port data to 0).
Without the elapse of the 30 system clock interval the step-up circuit will not start up, and it
will not be possible for a large current to flow, making operation unstable.
8.7.3 Pin Functions
The port 9 pin functions are shown below.
• P91/PWMn+1 to P90/PWMn+1 pins
PMR9n
Pin Function
0
P9n output pin
(n = 1, 0)
1
PWMn+1 output pin
Rev. 7.00 Mar. 08, 2010 Page 206 of 510
REJ09B0024-0700