Port Mode Register 3 Format - NEC PD78052 User Manual

Remarks 1. f : Main system clock frequency (f
XX
2. f : Main system clock oscillation frequency
X
3. f : Subsystem clock oscillation frequency
XT
4. TI00 : 16-bit timer/event counter input pin
5. TM0 : 16-bit timer register
6. MCS : Oscillation mode selection register (OSMS) bit 0
7. Figures in parentheses apply to operation with f
(2) Port mode register 3 (PM3)
This register set port 3 input/output in 1-bit units.
When using the P35/PCL pin for clock output function, set PM35 and output latch of P35 to 0.
PM3 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PM3 to FFH.
7 6 5
Symbol
PM3 PM37 PM36 PM35 PM34
CHAPTER 12 CLOCK OUTPUT CONTROL CIRCUIT
Figure 12-4. Port Mode Register 3 Format
4 3 2 1 0
PM33 PM32 PM31 PM30
or f /2)
X X
= 5.0 MHz or f
X XT
After
Address
Reset
FF23H FFH
PM3n P3n Pin Input/Output Mode Selection (n = 0 to 7)
0 Output mode (output buffer ON)
1 Input mode (output buffer OFF)
= 32.768 kHz.
R/W
R/W
259