Datasheet

Section 8 I/O Ports
Rev. 3.00 Mar 21, 2006 page 181 of 788
REJ09B0300-0300
8.4.4 Pin Functions
• P37/D15/HDB7/SERIRQ
*
, P36/D14/HDB6/LCLK
*
, P35/D13/HDB5/LRESET
*
,
P34/D12/HDB4/LFRAME
*
, P33/D11/HDB3/LAD3
*
, P32/D10/HDB2/LAD2
*
,
P31/D9/HDB1/LAD1
*
, P30/D8/HDB0/LAD0
*
The pin function is switched as shown below according to the combination of the HI12E bit in
SYSCR2, the LPC3E to LPC1E bits in HICR0 of host interface (LPC), the P3nDDR bit, and
operating mode.
Note: * Not supported by the H8S/2148B and H8S/2145B (5-V version).
Operating
Mode
Mode 1, 2, 3
(EXPE = 1)
Mode 2, 3 (EXPE = 0)
LPCmE All 0 All 0 Not all 0
HI12E 0 0 1 0
P3nDDR — 0 1 — 0
Pin Function D15 to D8
input/output
pins
P37 to P30
input pins
P37 to P30
output pins
HDB7 to HDB0
input/output
pins
LPC
input/output
pins
Notes: The combination of bits not described in the above table must not be used.
m = 3 to 1: LPC input/output pins (SERIRQ, LCLK, LRESET, LFRAME, LAD3 to LAD0)
when at least one of LPC3E to LPC1E is set to 1.
n = 7 to 0
8.4.5 Port 3 Input Pull-Up MOS
Port 3 has an on-chip input pull-up MOS function that can be controlled by software. This input
pull-up MOS function can be specified as on or off on a bit-by-bit basis.
Table 8.4 summarizes the input pull-up MOS states.
Table 8.4 Input Pull-Up MOS States (Port 3)
Mode Reset
Hardware
Standby Mode
Software
Standby Mode
In Other
Operations
1, 2, 3 (EXPE = 1) Off Off
2, 3 (EXPE = 0)
Off Off
On/Off On/Off
Legend:
Off: Input pull-up MOS is always off.
On/Off: On when the pin is in the input state, P3DDR = 0, and P3PCR = 1; otherwise off.