UPD780828A Datasheet, PDF (337/472 Pages) NEC – 8-bit Single-Chip Microcontroller

Chapter 19 Meter Controller / Driver
19.1 Meter Controller/Driver Functions
The meter controller/driver is a function to drive a stepping motor for external meter control or cross coil.
• Can set pulse width with a precision of 8 bits
• Can set pulse width with a precision of 8 + 1 bits with 1-bit addition function
• Can drive up to four 360° type meters
Figure 19-1 shows the block diagram of the meter controller/driver.
Figure 19-2 shows 1-bit addition circuit block diagram.
fx
fx/8
fx/16
fx/64
fx/128
fx/256
fx/512
TM52out
Figure 19-1: Meter Controller/Driver Block Diagram
Internal Bus
Timer mode control
register (MCNTC)
PCS PCE
Port mode control
register (PMC)
MODn ENn
Selector
fx/2
Compare register
(MCMPn0)
Compare register
(MCMPn1)
8-bit timer register
OVF
fcc
1-bit addition circuit
S
Q
R
MODn ENn
Output control circuit
SMn1(sin+)
SMn2(sin-)
MODn ENn
1-bit addition circuit
S
Q
R
Output control circuit
SMn3(cos+)
SMn4(cos-)
2
2
SMCL2 SMCL1 SMCL0
Meter C/D clock
selection (SMSWI)
TENn ADBn1 ADBn0 DIRn1 DIRn0
Internal Bus
Compare control
register n (MCMPCn)
Remark: n = 1 to 4
The meter controller/driver is a peripheral to control/drive up to four external meters (stepper motor/
cross coil motors).
User’s Manual U16504EE1V1UD00
337